Mathematics
Ghostyprime
2020-04-24 12:58:30
Mrs. Gomes found that 40% of students at her high school take chemistry. She randomly surveys 12 students. What is the probability that exactly 4 students have taken chemistry? Round the answer to the nearest thousandth. A)0.005 B)0.008 C)0.213 D)0.227
ANSWERS
kaylinwillet
2020-04-24 16:14:44

Binomial formula is : [latex]P ( k = 4 ) = nCk * p ^{k}(1-p) ^{n}= \ =495 * 0.4 ^{4}* ( 0.6 ) ^{8}= [/latex] = 495 * 0.0256 * 0.0167961 = = 0.21284 ≈ 0.213 Answer: C ) 0.213

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