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11. Assume that when adults with smartphones are randomly? selected, 57?% use them in meetings or...

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Basic Math

11. Assume that when adults with smartphones are randomly?selected, 57?% use them in meetings or classes. If 20 adultsmartphone users are randomly? selected, find the probability thatexactly 15 of them use their smartphones in meetings orclasses.

The probability is _____

?(Round to four decimal places as? needed.)

12. Assume that when adults with smartphones are randomly?selected, 58?% use them in meetings or classes. If 10 adultsmartphone users are randomly? selected, find the probability thatat least 7 of them use their smartphones in meetings orclasses.

The probability is_____

?(Round to four decimal places as? needed.)

13. A survey showed that 76?% of adults need correction?(eyeglasses, contacts,? surgery, etc.) for their eyesight. If 8adults are randomly? selected, find the probability that no morethan 1 of them need correction for their eyesight. Is 1 asignificantly low number of adults requiring eyesight?correction?

The probability that no more than 1 of the 8 adults requireeyesight correction is _____.

?(Round to three decimal places as? needed.)

Answer & Explanation Solved by verified expert
4.0 Ratings (581 Votes)
Please note nCx n nxx Binomial Probability nCx px qnx where n number of trials and x is the number of successes Also sum of    See Answer
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