Question

A manufacturing process produces bags of chips whose weight is N(16 oz, 1.5 oz). On a given day, the quality control officer takes a sample of 36 bags and computed the mean weight of these bags. The probability that the sample mean weight is below 16 oz is

Group of answer choices:

A. 0.55

B. 0.45

C. 0.50

D. 0.60

Answer 1

Solution :

= / n = 1.5 / 36 =  0.25

P( < 16) = P(( - ) / < (16 - 16) / 0.25)

= P(z < 0)

= 0.50

Option C)