66​% of U. S. adults have very little confidence in newspapers. You randomly select 10 U. S. adults. Find the probability that the number of U. S. adults who have very little confidence in newspapers is ​ (a) exactly​ five, (b) at least​ six, and​ (c) less than four.

a) 0.1434 = 14.34% probability that the number of U.S. adults who have very little confidence in newspapers is exactly five.

b) 0.7731 = 77.31% probability that the number of U.S. adults who have very little confidence in newspapers is at least six.

c) 0.022 = 2.2% probability that the number of U.S. adults who have very little confidence in newspapers is less than four.

Step-by-step explanation:

For each adult, there are only two possible outcomes. Either they have very little confidence in newspapers, or they do not. Adults are independent. This means that we use the binomial probability distribution to solve this question.

Binomial probability distribution

The binomial probability is the probability of exactly x successes on n repeated trials, and X can only have two outcomes.

In which is the number of different combinations of x objects from a set of n elements, given by the following formula.

And p is the probability of X happening.

66​% of U.S. adults have very little confidence in newspapers.

This means that

You randomly select 10 U.S. adults.

This means that

(a) exactly​ five

This is P(X = 5). So

0.1434 = 14.34% probability that the number of U.S. adults who have very little confidence in newspapers is exactly five.

(b) at least​ six

This is:

So

0.7731 = 77.31% probability that the number of U.S. adults who have very little confidence in newspapers is at least six.

(c) less than four.

This is:

.

So

0.022 = 2.2% probability that the number of U.S. adults who have very little confidence in newspapers is less than four.

what are the options? ?

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