Question

Google it: According to a recent report,

68%

of Internet searches in a particular month used the Google search engine. Assume that a sample of

21

searches is studied. Round the answers to four decimal places.

Part 1 of 4

(a) What is the probability that exactly

18

of them used Google?

The probability that exactly 18 of them used Google is .

Part 2 of 4

(b) What is the probability that

13

or fewer used Google?

The probability that 13 or fewer used Google is .

Part 3 of 4

(c) What is the probability that more than

18

of them used Google?

The probability that more than 18 of them used Google is .

Part 4 of 4

(d) Would it be unusual if fewer than

10

used Google?

It ▼(Choose one) be unusual if fewer than 10 used Google since the probability is .

Answer 1

d).the probability that fewer than 10 of then used google is :-

= P(X<10)

= 0.0151 [ in any blank cell of excel type =BINOM.DIST(9,21,0.68,TRUE) ]

It seems to be unusual if fewer than 10 used Google since the probability is 0.0151, less than 0.05.

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