Your answers to both problems are wrong.
I am assuming your n is the 20 jars from the second question.
SEm = SD/√n = 9/√20 = 9/4.47 = ?
Z = (score-mean)/SEm
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability related to the Z scores.
The amount of fill (weight of contents) put into a glass jar of spaghetti sauce is normally distributed with mean ì = 843 grams and standard deviation of ó = 9 grams
(ii) Find the standard error of the x distribution. (Give your answer correct to two decimal places.)
21.63 .
(e) Find the probability that a random sample of 20 jars has a mean weight between 836 and 855 grams. (Give your answer correct to four decimal places.)
0.1711
1 answer
1 answer