The wildlife department has been feeding a special food to rainbow trout fingerlings in a pond. A sample of the weights of 40 trout revealed that the mean weight is 402.7 grams and the standatd deviation 8alE8 gr. What is the probability that the mean weight for a sample of 40 trout exceeds 405.5 grams?

Answer 1

find p-value when
z >(x-mean)/(standard deviation)
by looking up in the z-score chart