*7. In a normal distribution, what proportion of cases fall: (a) outside the limits z 21:00 and z 11:00? (b) outside the limits

*7. In a normal distribution, what proportion of cases fall:

(a) outside the limits z ¼ 21:00 and z ¼ 11:00?

(b) outside the limits z ¼ 2:50 and z ¼ 1:50?

(c) outside the limits z ¼ 21:26 and z ¼ 11:83?

(d) outside the limits z ¼ 21:96 and z ¼ 11:96?

Exercises 111