Question

A study indicates that 18- to 24- year olds spend a mean of 130 minutes watching video on their smartphones per month. Assume that the amount of time watching video on a smartphone per month is normally distributed and that the standard deviation is 15 minutes. Complete parts (a) through (d) below.

a) What is the probability that an 18- to 24-year-old spends less than 100 minutes watching video on his or her smartphone per month?

b) What is the probability that an 18- to 24-year-old spends between 100 and 150 minutes watching video on his or her smartphone per month?

c) What is the probability that an 18- to 24-year-old spends more than 150 minutes watching video on his or her smartphone per month?

d) One percent of all 18- to 24-year-olds will spend less than how many minutes watching video on his or her smartphone per month?

Answer #1

A study indicates that 18- to 24- year olds spend a mean of
145 minutes watching video on their smartphones per month. Assume
that the amount of time watching video on a smartphone per month is
normally distributed and that the standard deviation is 10 minutes.
Complete parts (a) through (d) below.
a.What is the probability that an 18- to 24-year-old spends
less than 140 minutes watching video on his or her smartphone per
month?The probability that an 18- to...

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#4
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A recent study has shown that 28% of 18-34 year olds check their
Facebook/Instagram feeds before getting out of bed in the
morning,
If we sampled a group of 150 18-34 year olds, what is the
probability that the number of them who checked their social media
before getting out of bed is:
a.) At least 31?
b.) No more than 52?
c.) between 36 and 44 (including 36 and 44)?

A recent study has shown that 28% of 18-34 year olds check their
Facebook/Instagram feeds before getting out of bed in the
morning,
If we sampled a group of 150 18-34 year olds, what is the
probability that the number of them who checked their social media
before getting out of bed is:
a.) At least 31?
b.) No more than 52?
c.) between 36 and 44 (including 36 and 44)?

On the planet of Mercury, 4-year-olds average 2.9 hours a day
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We randomly survey one Mercurian 4-year-old living in a rural area.
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a) 0.8665
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1. According to an article published on the Web site,
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suppose that for adults the average amount of time spent
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A) .04 B) .08 C) .11 D) .13 E) .16
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