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According to an informational technology advisory firm 33% of mobile phones worldwide use a certain operating...

According to an informational technology advisory firm 33% of mobile phones worldwide use a certain operating system in 2013 a random sample of 38 mobile phone users was selected in 2013 use the normal approximation to the binomial distribution to answer parts a through E below

A calculate the mean and standard deviation
B. What is the probability that 15 or more of the 30 mobile phone users have this operating system
C what is the probability that exactly 16 of the 38 phone users have this operating system
D what is the probability that 9, 10or 11 of the 38 mobile phone user is have this operating system
E what is the probability that 16, 17 or 18 of the 38 mobile phone users have this operating system

math   Statistics-And-Probability   
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Answer #1

p (X-从く 15-12-54. 2 8986 using Normal roimatioh -p/ 15-5-12-54 ㄑㄧㄨㄧ从ーく 15-5-12:54 2.89β6 16-5-12:54 〈스시 く 16-5-12 ㄑㄧㄨ-u- 2.898 6 - P(2 41.3662) -Pz < I o212) 0.9141 - o-B464- ple-5-12:54 9-5-12-54 2 8986 ㄑ ㄨ-시 < 2 8986 p (-1.3936く2 <-1.0486 P1048e) - Plz <1.3838) 0.14 1 - 083 2 o, o 639 p(x210) = p (9.5(X 10.5)

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