Assume that when adults with smartphones are randomly selected, 51 % use them in meetings or classes. If 8 adult smartphone users are randomly selected, find the probability that at least 4 of them use their smartphones in meetings or classes.
The probability is _______ .
ANSWER :
p = 51% = 0.51 ; q = 1 - p = 1 - 0.51 = 0.49
P( X ≥ 4 out of 8)
= 1 - P( X < 4)
= 1 - P(0) - P(1) - P(2) - P(3)
= 1 - 0.49^8 - 8 * 0.51^1 * 0.49^7 - 8*7/2 * 0.51^2 * 0.49^6 - 8*7*6/6 * 0.51^3 * 0.49^5
= 0.6584 (ANSWER)
Assume that when adults with smartphones are randomly selected, 51% use them in meetings...
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