## Answers

For a Binomial Random Variable mean and standard deviation is given by-

where, n: independent trials and p: probability of success

**Given:**

So, the mean number of online retail orders that turns out to be fraudulent is

So, the standard deviation is calculated as

Mean, u np

Standard deviation, o Vnp(1- p)

n 19, p 0.05

Lnp 19(0.05) = 0.95)

0.95

= Vnp(1 - p) =19 * 0.05 (1 - 0.05) V0.95 * 0.95 0.95

0,95

.
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