A particular variety of watermelon weighs on average 24 pounds with a standard d

Question

A particular variety of watermelon weighs on average 24 pounds with a standard deviation of 1.35 pounds. Consider the sample mean weight of 68 watermelons of this variety. Assume the individual watermelon weights are independent. What is the expected value of the sample mean weight? Give an exact answer. What is the standard deviation of the sample mean weight? Give your answer to four decimal places. What is the approximate probability the sample mean weight will be less than 24.29? Give your answer to four decimal places. Use the standard deviation as you entered it above to answer this question. What is the value c such that the approximate probability the sample mean will be less than c is 0.92? Give your answer to four decimal places. Use the standard deviation as you entered it above to answer this question.

Explanation / Answer

a).

expected value of the sample mean = 24 pounds

b).

SD of the sample mean =sd/sqrt(n) =1.35/sqrt(68) =0.1637

c)

z value for 24.29, z=(24.29-24)/0.1637 =1.77

p( x < 24.29) = P( z < 1.77) = 0.9616

d).

From standard normal table, P( z < 1.4051) =0.92

The required value = 24+1.4051*0.1637 =24.2300

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