1. A certain type of radio tubes lasts on the average of 2 years with the...
1. A certain type of radio tubes lasts on the average of 2 years with the standard deviation of 0.4 year. Assuming that the radio tubes are normally distributed. Find the probability that given tubes will last less than 1.5 years.
- Two hundred college freshmen have their grades in the normal distribution with the mean of 2.2 and standard deviation of 0.6. How many of these freshmen have their grades between 2.0 and 2.5 inclusive?
- Suppose that in an examination, the cut off scores for passing is 75 for 200 people. If the mean of the test is 84 with the standard deviation of 5 and scores are normally distributed. A) what proportion of people passed the test? B) How many have a scores between 80 and 86?
ps. answer all of them please :(
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1. A certain type of radio tubes lasts on the average of 2 years
with the...
A certain type of storage battery lasts, on average, 3.5 years with a standard deviation of...
A certain type of storage battery lasts, on average, 3.5 years with a standard deviation of 0.5 year. Assuming that ‘battery life’ is normally distributed, what percentage of batteries last between 3.0 and 4.0 years?
A certain type of device lasts on average 6 years with a variance of 4 years....
A certain type of device lasts on average 6 years with a variance of 4 years. assume the device life is normally distributed. find: 1- the probability that the device will lasts between 2 and 3 years 2- the probability that the device will lasts less than 10 years 3- find a value d such that the device life is in the range of 7 ± d with probability of 0.08076 (explain this point carefully)
The board of examiners that administers the real estate brokerʹs examination in a certain state found...
The board of examiners that administers the real estate brokerʹs examination in a certain state found that the mean score on the test was 375 and the standard deviation was 36. If the board wants to set the passing score so that only the best 80% of all applicants pass, what is the passing score? Assume that the scores are normally distributed
The board of examiners that administers the real estate broker's examination in a certain state found...
The board of examiners that administers the real estate broker's examination in a certain state found that the mean score on the test was 498 and the standard deviation was 72. If the board wants to set the passing score so that only the best 80% of all applicants pass, what is the passing score? Assume that the scores are normally distributed. O 406 O 570 O 498 439
IQ scores (as measured by the Stanford-Binet intelligence test) in a certain country are normally distributed...
IQ scores (as measured by the Stanford-Binet intelligence test) in a certain country are normally distributed with a mean of 85 and a standard deviation of 19. Find the approximate number of people in the country (assuming a total population of 323,000,000) with an IQ higher than 121. (Round your answer to the nearest hundred thousand.) people
Please help with steps on how to solve this The mean of the data for the...
Please help with steps on how to solve this The mean of the data for the resting heart rate of adults is 72 beats per minute, and the standard deviation is 5 beats per minute. The results of the data were normally distributed. About what percentage of the population has a resting heart rate between 57 and 72? The mean of normally distributed test scores is 81 and the standard deviation is 5. If there are 246 test scores in...
1. IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. a. What ...
all questions. Do not round
answers
1. IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. a. What percentage of scores is between 55 and i 15? b. In a group of 20,000 randomly selected individuals, how many have an IQ score of 130 or more? 2. A Honda Civic has its gas mileage (in miles per gallon, or mpg) normally distributed, with a mean of 33 mpg and a standard deviation of...
Question 13 (1 point) Let's look at grades again. Let's say that the grades for a...
Question 13 (1 point) Let's look at grades again. Let's say that the grades for a particular test are Normally Distributed with mean=80 and standard deviation = 7. What's the probability that a random student scores a grade between 80 and 90? Op=.3154 p=.842 Op=.4234 Op=.67
Question 13 (1 point) Let's look at grades again. Let's say that the grades for a...
Question 13 (1 point) Let's look at grades again. Let's say that the grades for a particular test are Normally Distributed with mean=80 and standard deviation = 7. What's the probability that a random student scores a grade between 80 and 90? Op=.3154 p=.842 Op=.4234 Op=.67
1.) What are the two requirements for a distribution to be considered approximately Normal? a._____________________ b._____________________...
1.) What are the two requirements for a distribution to be considered approximately Normal? a._____________________ b._____________________ 2.) What percent of observations is a normally distributed set of data are: a. Between the mean and -2 standard deviations?__________________ b. Between -1 standard deviations and +3 standard deviations? ___________________ c. Above +1 standard deviations? ________________________ 3.) If a particular IQ test is standardized to the model N(100, 14), what percent of people should have scores between 86 and 128? ____________________________
The board of examiners that administers the real estate broker's examination in a certain state found that the mean score on the test was 498 and the standard deviation was 72. If the board wants to set the passing score so that only the best 80% of all applicants pass, what is the passing score? Assume that the scores are normally distributed. O 406 O 570 O 498 439
all questions. Do not round
answers
1. IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. a. What percentage of scores is between 55 and i 15? b. In a group of 20,000 randomly selected individuals, how many have an IQ score of 130 or more? 2. A Honda Civic has its gas mileage (in miles per gallon, or mpg) normally distributed, with a mean of 33 mpg and a standard deviation of...
Question 13 (1 point) Let's look at grades again. Let's say that the grades for a particular test are Normally Distributed with mean=80 and standard deviation = 7. What's the probability that a random student scores a grade between 80 and 90? Op=.3154 p=.842 Op=.4234 Op=.67
Question 13 (1 point) Let's look at grades again. Let's say that the grades for a particular test are Normally Distributed with mean=80 and standard deviation = 7. What's the probability that a random student scores a grade between 80 and 90? Op=.3154 p=.842 Op=.4234 Op=.67
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