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Scott, MIT Graduate

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5. (8) the time required automotive center to

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5. (8) the time required for an automotive center to complete an oil change service on an automobile approximately follows a normal distribution, with a mean of 19 minutes and a standard deviation of 3 minutes A) the automotive center guarantees customers that the serrvice will take not longer than 20 minutes if it does take longer the customer will recieve the service for half price what percent of the customers recive the service for half price? B) the guaranteed time limit is ___ minutes (round up to the nearest integer as needed)

Submitted: 1 year ago.

Category: Homework

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Customer:replied 1 year ago.

for some reason it didn't include my file which I originally included

Customer:replied 1 year ago.

1. steel rods are manufactured with a mean length of 30 centimeter. because of the variability in the manufacturing process, the lengths of the rods are approximately normally distributed with a standard deviation of .06 cm A) what proportion of rods has a length less than 29.9 cm (round to 4 decimal places) B) any rods that are shorter than 29.85 cm or longer than 30.15 cm are discarded so what proportion of rods will be discarded c)using the results of part b if 5000 rods are manufactured in a day how many should the plant manager expect to discard? d)if an order comes in for 10,000 steel rods how many rods should the plant manager expect to maufacture if the order states that all rods must be between 29.9 and 30.1 cm 2. In a recent poll, 35 % of survey respondents said that, if they only had one child, they would prefer the child to be a boy. Suppose you conducted a survey of 170 randomly selected students on your campus and find that 70 of them would prefer a boy. A) the probility that at least 70 students would prefer a boy is ______ B) does the result from part a contradict the poll (multiple choice)? yes probability from part a is greater than 5% therefor the survey results are unusual, yes the probability from part a is less than 5% so the survey results are unusual, no proability from part a is less than 5% therefor the results are not unusual, no probability from part a is greater than 5% so the results are not unusual 3. (6)Suppose a sample of O ring was obtained and the wall thickness in inches of each was recorded us a normal probability plot to assess whether the sample data could have come from a population that is normally distributed 0.159 0.192 0.206 0.217 0.225 0.223 0.241 0.242 0.258 0.266 0.276 0.284 0.295 0.303 0.313 0.332 -Yes since the relationship between the expected z-values and the observed values is approximately linear -No since the relationship between the expected z-values and the observed values is not linear -Yes since the relationship between the expected z values and the observed values is not linear -No since the relationship between the expected z values and the observed values is approximately linear 5. (8) the time required for an automotive center to complete an oil change service on an automobile approximately follows a normal distribution, with a mean of 19 minutes and a standard deviation of 3 minutes A) the automotive center guarantees customers that the serrvice will take not longer than 20 minutes if it does take longer the customer will recieve the service for half price what percent of the customers recive the service for half price? B) the guaranteed time limit is ___ minutes (round up to the nearest integer as needed)