# Probability of Binomial Random Variable

Based upon past experience, 1% of the telephone bills mailed to households are incorrect. A sample of 20 bills is selected.

a. Is this a valid Binomial experiment?

b. What is the mean of the probability distribution?

c. What is the standard deviation of the probability distribution?

d. What is the probability that 10 of the bills is incorrect?

https://brainmass.com/statistics/binomial/probability-binomial-random-variable-593911

#### Solution Preview

a. Yes, this is a valid binomial experiment because: 1. there are fixed number of trials (20 here). 2. there are ...

#### Solution Summary

The solution gives detailed steps on finding the mean, standard deviation and probability of binomial random variable.

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