4 It is reported that 65 of working women use computers at w

4. It is reported that 65% of working women use computers at work. Choose S working women at random. Find a. The probability that at least 1 doesn?t use a computer at work b. The probability that all 5 use a computer In their jobs

Solution

p=0.65

q=1-p=0.35

the distibution is binomial distirbution wiht n=5

a) P(atleast 1 use doesnt use a computer at work)=1-P(all five use computer at work) =1-0.1160=0.8839

Use BINOMDIST function in excel.

b) P(all five use computer)=P(x=5)=0.1160.