Discuss the below:
Q1: A manufacturer claims that the life span of its products is normally distributed, with a mean of 21.9 hours and a standard deviation 102 hours. A test is made of 20 products and the sample time are shown below. Find the mean and the standard deviation of the sample. Compare the sample mean and standard deviation to the manufactures claims.
19,20,17,21,21,21,19,18,19,19
17,17,15,18,18,18,18,18,18,17.
Q2: Compare the sample mean and standard deviation of the sample with those in the manufactures claim