5.125.12

Consider the following binomial random variables.

(a) The number of tails seen in

52

tosses of a quarter.

(i) Find the mean. (Give your answer correct to one decimal place.)

(ii) Find the standard deviation. (Give your answer correct to two decimal places.)

(b) The number of left-handed students in a classroom of

47

students (assume that

8%

of the

population is left-handed).

(i) Find the mean. (Give your answer correct to one decimal place.)

(ii) Find the standard deviation. (Give your answer correct to two decimal places.)

(c) The number of cars found to have unsafe tires among the

372

cars stopped at a roadblock for

inspection (assume that

20%

of all cars have one or more unsafe tires).

(i) Find the mean. (Give your answer correct to one decimal place.)

(ii) Find the standard deviation. (Give your answer correct to two decimal places.)

(d) The number of melon seeds that germinate when a package of

58

seeds is planted (the

package states that the probability of germination is

0.79

.

(i) Find the mean. (Give your answer correct to one decimal place.)

(ii) Find the standard deviation. (Give your answer correct to two decimal places.)

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