3. The probability that a housewife buys brand A soap is 0.75. Find the probability that in a sample of 15 housewives who bought soap for a certain day, (a) exactly 4 of them bought brand A soap. (b) more than 6 of them bought brand A soap. X~BC 15,0.75) →B C15,0 25) 70.5 a) PCX = 4) => PCY= 1) b) P C X>G) => PCY< 9)

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
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Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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3. The probability that a housewife buys brand A soap is
0.75. Find the probability that in a sample of 15
housewives who bought soap for a certain day,
(a) exactly 4 of them bought brand A soap.
(b) more than 6 of them bought brand A soap.
X ~BC 15,0.75) → C15,0 25)
70-5
a) PCX = 4) => PCY= 1)
b) P Cx >G) => PCY<9)
Transcribed Image Text:3. The probability that a housewife buys brand A soap is 0.75. Find the probability that in a sample of 15 housewives who bought soap for a certain day, (a) exactly 4 of them bought brand A soap. (b) more than 6 of them bought brand A soap. X ~BC 15,0.75) → C15,0 25) 70-5 a) PCX = 4) => PCY= 1) b) P Cx >G) => PCY<9)
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