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The number of hours spent online by college students is claimed to be 22.5 hours per...

The number of hours spent online by college students is claimed to be 22.5 hours per week with a standard deviation of 2.1 hours.

a)suppose we randomly select 50 college students, what is the probability that the mean number of hours online is greater than 25 B) Suppose i survey the 50 game programming students and the mean number of hours spent online is 25 hours per week. Is this unusual? Why or why not?

math   Statistics-And-Probability   
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Answer #1

Px 25) Normal distributio 4225, σ=21,n:50 we con vest tnis co standard noma } US, i ing 25-(22-5) 2-1/N50 Z: 8417938:842 PZ42) co to me right of 842 8.42 P( X>25)-P(z>8.4 2)-1-P(z<842):1-1.0000PLZL842)Since 8.4is a bove 3.4q Using technoiogy answeY is O-o00000 000000 Now that we have Used folulowig fos tme nomality C

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