Solution for problem 19SE Chapter 4
A cereal manufacturer claims that the gross weight
Statistics for Engineers and Scientists | 4th Edition
A cereal manufacturer claims that the gross weight (including packaging) of a box of cereal labeled as weighing 12 oz has a mean of 12.2 oz and a standard deviation of 0.1 oz. You gather 75 boxes and weigh them all together. Let S denote the total weight of the 75 boxes of cereal.
a. If the claim is true, what is \(P(S \leq 914.8)\)?
b. Based on the answer to part (a), if the claim is true, is 914.8 oz an unusually small total weight for a sample of 75 boxes?
c. If the total weight of the boxes were 914.8 oz, would you be convinced that the claim was false? Explain.
d. If the claim is true, what is \(P(S \leq 910.3)\)?
e. Based on the answer to part (d), if the claim is true, is 910.3 oz an unusually small total weight for a sample of 75 boxes?
f. If the total weight of the boxes were 910.3 oz, would you be convinced that the claim was false? Explain.
Equation transcription:
Text transcription:
P(S \leq 914.8)
P(S \leq 910.3)
Solution
Step 1 of 7
Here we have to find the normal probabilities for the given conditions
The given mean
The given standard deviation is
Let S denote the weight of the 75 boxes
Then S is a normal variate with mean =75(12.2)
=915
Standard deviation=0.1
=0.866
Chapter 4, Problem 19SE is Solved
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A cereal manufacturer claims that the gross weight