A) The manufacturer of disk drives used in one of the well known brands of microcomputers knows from past experience that 10% of the disk drives malfunction during the warranty period. In a random sample of 150 disk drives use a normal approximation distribution to find the probability that at most 20 will malfunction during the warranty period (hint: use 0.5 continuity correction factor)

A) 0.067

B) 0.342

C) 0.032

D) 0.658

E)0.933

B)

In a small consultancy company of 10 employeees, three earn $20 an hour, five earn $24 an hour and two earn $32 an hour. Find the average hourly wage rate for the whole company.

A) 24.40

B) 26

C)25.33

D 25.50

E) 24