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Debora [2.8K]
3 years ago
14

A market research firm conducts telephone surveys with a 40% historical response rate. What is the probability that in a new sam

ple of 400 telephone numbers, at least 150 individuals will cooperate and respond to the questions? In other words, what is the probability that the sample proportion will be at least 150/400 = .375 (to 4 decimals)?
Mathematics
1 answer:
Flauer [41]3 years ago
8 0

Answer:

100%

Step-by-step explanation:

If there is a 40% response rate and there are 400 numbers, that means that 160 people will respond.

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To find both f(8) and f(-5), we will need to plug in their values for x and solve for each. Then, we can subtract them to find the final answer.

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