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...

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 90% confidence interval for the mean number of marshmallows?

Group of answer choices