Mean is 200
Standard deviation is sqrt(.02*.98*10,000)= 14
z score is (218.5-200)/14= 1.32 (218.5 is for continuity correction)
Checking normal table probability of a z score of 1.32 or greater is .0934.
You have been hired by Ford Motor Company to do market research and you must estimate the percentage of households in which a vehicle is owned. How many households must you survey if you want to be 94% confident that your sample percentage has a margin of error within 0.03? (5) The monthly utility bills in a city are normally distributed with a mean of $100 and a standard deviation of $1 If 300 utility bills are randomly...
Estimate the indicated probability by using the normal distribution as an approximation to the binomial distribution. In one county the conviction rate for speeding is 85%. Estimate the probability that of the next 100 speeding summons issued, there will be at least 90 convictions.
indicated probability by using the normal distribution as an approximation to the binomial distribution. 12) A multiple choice test consists of 60 questions. Each question has 4 possible answers of which one is correct. If Estimate the all answers are random guesses, estimate the probability of getting at least 20% correct.
Estimate the indicated probability by using the normal distribution as an approximation to the binomial distribution A multiple choice test consists of 60 questions. Each question has 4 possible answers of which one is correct. If all answers are random guesses, estimate the probability of getting a least 20% correct 0.8508 0.1492 0.0001 03505
A certain flight arrives on time 86 percent of the time. Suppose 169 flights are randomly selected. Use the normal approximation to the binomial to approximate the probability that (a) exactly 140 flights are on time. (b) at least 140 flights are on time. (c) fewer than 148 flights are on time. (d) between 148 and 159, inclusive are on time. (a) P( 140)- (Round to four decimal places as needed.) (b) PIX z 140)(Round to four decimal places as...
The company has two machines that produce certain items. Machine 1 produces 40 % of the the items, and machine 2 produces 60% of the items. Machine 1 produces 3% of defective items and machine 2 produces 5% of defective items. a. The probability that a randomly selected produced item is defective is b. If a randomly selected item is found to be defective, probability that it is produced on machine 2 is
2) Suppose the weight of a newborn baby follows a normal distribution with a mean of 3500 grams and a standard deviation of 600 grams. a. What is the probability that the weight of a randomly selected newborn exceeds 4000g? b. For a random sample of 36 newborns, what is the probability that their mean weight is less than 3450g? 3) Suppose that 5% of American adults are vegetarian. Find the probability that in a random sample of 500 American...
Question 30 1 pts A manufacturer of processing chips knows that two percent of its chips are defective in some way. Suppose an inspector randomly selects four chips for an inspection. (a) Find the probability that a randomly selected chip is NOT defective. (b) Find the probability that all four chips are NOT defective. (c) Find the probability that at least one of the selected chips is defective. (Round your answer to three decimal places).
Suppose that a computer chip company has just shipped 10,000 computer chips to a computer company. Unfortunately, 60 of the chips are defective. (a) Compute the probability that two randomly selected chips are defective using conditional probability. (b) The probability that the first randomly selected chip is defective is 60/10,000 = 0.006 = 0.6%. Compute the probability that two randomly selected chips are defective under the assumption of independent events. (a) The probability is _______ (Round to eight decimal places as needed.)
1) A coin is tossed 400 times. Use the normal curve approximation to find the probability of obtaining (a) between 185 and 210 heads inclusive; (b) exactly 205 heads; (c) fewer than 176 or more than 227 heads. 2) A process for manufacturing an electronic component yields items of which 1% are defective. A quality control plan is to select 100 items from the process, and if none are defective, the process continues. Use the normal approximation to the binomial...