Question

7. A survey of 250 lobster fishermen found that they catch an average of 32 pounds of lobster per day with a standard deviation of four pounds. If a random sample of 30 lobster fishermen is selected, what is the probability that their average catch is less than 31.5 pounds? 8. In applied statistics, the area under the normal distribution curve is more important than the frequencies. A) True B) False 9. The standard deviation of a distribution is 20. If a sample of 225 is selected, what is the standard error of the mean? 10. Find the value of a as shown in the figure below. 9896 A) 0.01 0.02 0.04 0.05

Answer 1

t rexo =32, 74, n= 30. Z = t-4 HIM PC T < 31-5)=P(EL 315-32) 3) = P(ZE-0-68) 4/30 -0.2483 483 8, Answer A, True ar=20, nezis a standard error = I = 20 = vo 11.333 1225 _ confidence level = 980 20098 le 1-X=0098 2 =1-0-98 10.027 Answees B, 0.02