MATH221

1) Jack weighs 160 pounds and his sister weighs 110 pounds. If the mean weight for men his age is 175 with a standard deviation of 14 pounds and the mean weight for women is 145 with a standard deviation of 10 pounds, determine whose weight is closer to "average." Write your answer in terms of z­scores and areas under the normal curve. for Jack z = 1.07 14 15 14 160 175 ≈ − − = − = − σ x µ , when z = ­1.07, area = .1423 for his sister 2.50 10 25 10 110...

1) Jack weighs 160 pounds and his sister weighs 110 pounds. If the mean weight for men his age is 175 with a standard deviation of 14 pounds and the mean weight for women is 145 with a standard deviation of 10 pounds, determine whose weight is closer to "average." Write your answer in terms of z-scores and areas under the normal curve. 2) Explain the difference between a population and a sample. In which if these is it important to distinguish between the two in order to use the correct f...