It has been determined that the average cell phone repair ( for major problems) is =...
It has been determined that the average cell phone repair ( for major problems) is = $ 243.66 with a stdev = x . if phone repairs fit a normal distribution, and 25.6% of repairs are higher than $ 286.24, find the stdev. Round answer to 2 decimal places.
Homework Answers
Add Answer to:
It has been determined that the average cell phone repair ( for
major problems) is =...
Cell Phone Lifetimes A recent study of the lifetimes of cell phones found the average is...
Cell Phone Lifetimes A recent study of the lifetimes of cell phones found the average is 24.3 months. The standard deviation is 2.6 months. If a company provides its 32 employees with a cell phone, find the probability that the mean lifetime of these phones will be less than 23.7 months. Assume cell phone life is a normally distributed variable, the sample is taken from a large population and the correction factor can be ignored. Round the final answer to...
The Specific Absorption Rate (SAR) for a cell phone measures the amount of radio frequency (RF)...
The Specific Absorption Rate (SAR) for a cell phone measures the amount of radio frequency (RF) energy absorbed by the user's body when using the handset. Every cell phone emits RF energy. Different phone models have different SAR measures. To receive certification from the Federal Communications Commission (FCC) for sale in the United States, the SAR level for a cell phone must be no more than 1.4 watts per kilogram. A sample of 50 models was tested and the average...
The average monthly cell phone bill was reported to be $73.00 by the U.S. Wireless Industry....
The average monthly cell phone bill was reported to be $73.00 by the U.S. Wireless Industry. A random sampling of ten large cell phone company found the following monthly cell phone charges yields a sample mean of $78.47 with a population standard deviation of $7.41. At the 0.05 level of significance, can it be concluded that the average monthly cell phone bill differs from $73.00? Question 24 (2.63 points) Which test are you running? One mean z-test Chi-Square Goodness of...
Automobile repair costs continue to rise with the average cost now at $367 per repair. Assume...
Automobile repair costs continue to rise with the average cost now at $367 per repair. Assume that the cost for an automobile repair is normally distributed with a standard deviation of $88. Answer the following questions about the cost of automobile repairs. (a) What is the probability that the cost will be more than $450? (Round your answer to four decimal places.) (b) What is the probability that the cost will be less than $220? (Round your answer to four...
Automobile repair costs continue to rise with the average cost now at $367 per repair.† Assume...
Automobile repair costs continue to rise with the average cost now at $367 per repair.† Assume that the cost for an automobile repair is normally distributed with a standard deviation of $88. Answer the following questions about the cost of automobile repairs. (b) What is the probability that the cost will be less than $260? (Round your answer to four decimal places.) (c) What is the probability that the cost will be between $260 and $480? (Round your answer to...
Suppose that a phone company reports that the average duration of a cell phone call is...
Suppose that a phone company reports that the average duration of a cell phone call is 1.7 minutes, with a standard deviation of 1.4 minutes. 1. Would it be reasonable to use a normal distribution to model the duration of cell phone calls? Explain, based primarily on the values reported above. 2. Suppose you want to examine a random sample of 60 cell phone calls. Do you think it would be reasonable to use the Central Limit Theorem to describe...
Reserve Problems Chapter 8 Section 2 Problem 5 am 1 A random sample has been taken...
Reserve Problems Chapter 8 Section 2 Problem 5 am 1 A random sample has been taken from a normal distribution. Output from a software package follows: Variable N Mean SE Mean StDev Variance Sum х ? ? 1.77 6.86 10 ? 762.30 3 (a) Fill in the missing quantities. in 1 ms en 2 N= Round your answers to two decimal places (e.g. 98.76). ns on 4 Mean = ms con 4 Variance = ems sion 1 (b) Find a...
It is reported that 41% of American households use a cell phone exclusively for their telephone...
It is reported that 41% of American households use a cell phone exclusively for their telephone service. In a sample of eight households, It is reported that 41% of American households use a cell phone exclusively for their telephone service. In a sample of eight households, Find the probability that no household uses a cell phone as their exclusive telephone service. (Round your answer to 4 decimal places.) Find the probability that exactly five households exclusively use a cell phone...
A company that produces cell phones claims its standard phone battery lasts longer on average than...
A company that produces cell phones claims its standard phone battery lasts longer on average than other batteries in the market. To support this claim, the company publishes an ad reporting the results of a recent experiment showing that under normal usage, their batteries last at least 34 hours. To investigate this claim, a consumer advocacy group asked the company for the raw data, which are shown to the right. Find a 90% confidence interval and state your conclusion. Explain...
18 Homework Problems Problem 18-1 Repair calls are handled by one repairman at a photocopy shop....
18 Homework Problems Problem 18-1 Repair calls are handled by one repairman at a photocopy shop. Repair time, including travel time, is exponentially distributed, with a mean of 25 hours per call Requests for copler repairs come in at a mean rate of 2.1 per eight-hour day (assume Poisson). a. Determine the average number of customers awaiting repairs. (Round your answer to 2 decimal places.) Number of customers b. Determine system utilization (Round your answer to the nearest whole percent....
The Specific Absorption Rate (SAR) for a cell phone measures the amount of radio frequency (RF) energy absorbed by the user's body when using the handset. Every cell phone emits RF energy. Different phone models have different SAR measures. To receive certification from the Federal Communications Commission (FCC) for sale in the United States, the SAR level for a cell phone must be no more than 1.4 watts per kilogram. A sample of 50 models was tested and the average...
The average monthly cell phone bill was reported to be $73.00 by the U.S. Wireless Industry. A random sampling of ten large cell phone company found the following monthly cell phone charges yields a sample mean of $78.47 with a population standard deviation of $7.41. At the 0.05 level of significance, can it be concluded that the average monthly cell phone bill differs from $73.00? Question 24 (2.63 points) Which test are you running? One mean z-test Chi-Square Goodness of...
Automobile repair costs continue to rise with the average cost now at $367 per repair. Assume that the cost for an automobile repair is normally distributed with a standard deviation of $88. Answer the following questions about the cost of automobile repairs. (a) What is the probability that the cost will be more than $450? (Round your answer to four decimal places.) (b) What is the probability that the cost will be less than $220? (Round your answer to four...
Reserve Problems Chapter 8 Section 2 Problem 5 am 1 A random sample has been taken from a normal distribution. Output from a software package follows: Variable N Mean SE Mean StDev Variance Sum х ? ? 1.77 6.86 10 ? 762.30 3 (a) Fill in the missing quantities. in 1 ms en 2 N= Round your answers to two decimal places (e.g. 98.76). ns on 4 Mean = ms con 4 Variance = ems sion 1 (b) Find a...
18 Homework Problems Problem 18-1 Repair calls are handled by one repairman at a photocopy shop. Repair time, including travel time, is exponentially distributed, with a mean of 25 hours per call Requests for copler repairs come in at a mean rate of 2.1 per eight-hour day (assume Poisson). a. Determine the average number of customers awaiting repairs. (Round your answer to 2 decimal places.) Number of customers b. Determine system utilization (Round your answer to the nearest whole percent....
Most questions answered within 3 hours.
-
Where is the error in this code sequence?
String s1 = "Hello";
String s2 = "ello";...
asked 10 months ago -
Financial data for Joel de Paris, Inc., for last year
follow:
Joel de Paris, Inc.
Balance...
asked 10 months ago -
Consider this reaction:
Al2(SO4)3 (aq)+ BaCl3
(aq) Al2Cl6 (aq)- +
3BaSO4(s) . What is the...
asked 10 months ago -
Suppose that Savneet is considering increasing her
recent random sample from 20 car rentals to 40...
asked 10 months ago -
Trucks arrive at an unloading terminal at an average rate of 120
per hour.
Trucks arrive...
asked 10 months ago -
Why are methanol and ethanol completely soluble in water while
octanol is not very little soluble....
asked 10 months ago -
A facilities manager at a university reads in a research report
that the mean amount of...
asked 10 months ago -
When the CuSO4 is rehydrated by adding water to the anhydrous
compound, is this an endothermic...
asked 10 months ago -
A ray of sunlight is passing from diamond into crown glass; the
angle of incidence is...
asked 10 months ago -
A block of mass 0.249 kg is placed on top of a light, vertical
spring of...
asked 10 months ago -
how do the kidneys compensate in the presences of acidosis
a) trigger hyperventilate
b) reserve acid...
asked 10 months ago -
Question 501 pts
The rental rate of capital to the firm increases. Which of the
following...
asked 10 months ago