You work for a consumer watchdog publication and are testing the advertising claims of a flash drive. The manufacturer claims that the life spans of the flash drives are normally distributed, with a mean of 80,000 runs and a standard deviation of 5000 runs. You test 14 flash drives and record the life spans shown below.

(a) Draw a frequency histogram to display these data. Use five classes. Do the life spans appear to be normally distributed? Explain.

(b) Find the mean and standard deviation of your sample.

(c) Compare the mean and standard deviation of your sample with those in the manufacturer claim. Discuss the differences.

Transcribed Image Text:

81,000 79,686 45,386 53,196 78,484 76,584 87,812 62,382 39,354 89,998 80,002 80,896 51,422 71,496