Based on a smartphone survey, assume that 40% of adults with smartphones use them in theaters....
Based on a smartphone survey, assume that 40% of adults with smartphones use them in theaters. In a separate survey of 227 adults with smartphones, it is found that 74 use them in theaters.a. If the 40% rate is correct, find the probability of getting 74 or fewer smartphone owners who use them in theaters.b. Is the result of 74 significantly low?
a. If the 40 rate is correct, the probability of getting 74 or fewer smartphone owners who use them in theaters is nothing. (Round to four decimal places as needed.)
Homework Answers
a) Mean = np = 227*0.40 = 90.8
Standard deviation = 
= 7.381
Hence,
P(74 or fewer)
= P(X < 74.5)
= P(z < (74.5 - 90.8)/7.381)
= P(z < -2.21)
= 0.0136
Add Answer to:
Based on a smartphone survey, assume that 40% of adults with
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Based on a smartphone survey, assume that
4343%
of adults with smartphones use them in theaters. In a separate
survey of
200200
adults with smartphones, it is found that
7373
use them in theaters.a. If the
4343%
rate is correct, find the probability of getting
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or fewer smartphone owners who use them in theaters.b. Is the
result of
7373
significantly low?
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4343%
rate is correct, the probability of getting
7373
or fewer smartphone owners who use...
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