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.)
