19. You are investigating whether there are enough raisins in a ceral box. You buy a sample of 10 cereal boxes at random. Your sample average is 400 raisins. Raisin distribution is Normal with a...

19.

You are investigating whether there are enough raisins in a ceral box. You buy a sample of 10 cereal boxes at random. Your sample average is 400 raisins. Raisin distribution is Normal with a standard deviation of 50 raisins. What is the 90% confidence interval for the mean number of raisins?

Group of answer choices