You are investigating whether there are enough little marshmallows in a ceral box. You buy a sample of 10 cereal boxes at random. Your sample average is 100 marshmallows. Marshmallow distribution is Normal with a standard deviation of 15 marshmallows. What is the 99% confidence interval for the mean number of marshmallows? Group of answer choices 61 to 139 96 to 104 88 to 112 91 to 109

MATLAB: An Introduction with Applications
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Author:Amos Gilat
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Chapter1: Starting With Matlab
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You are investigating whether there are enough little marshmallows in a ceral box. You buy a sample of 10 cereal boxes at random. Your sample average is 100 marshmallows. Marshmallow distribution is Normal with a standard deviation of 15 marshmallows. What is the 99% confidence interval for the mean number of marshmallows?
Group of answer choices
61 to 139
96 to 104
88 to 112
91 to 109 
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