help!!! statistics!!!?

1 ⤊

The probability of being left-handed is about 10%. What is the probability that exactly 2 out of 3 students are right-handed?

2007-06-12 15:28:23 · 3 answers · asked by Jennifer H 1 in Science & Mathematics ➔ Mathematics

X = no of right handed people
X ~ B(3,0.9)
P(X = 2) = 3*0.9^2 * 0.1 = 0.243

2007-06-12 15:32:01 · answer #1 · answered by Dr D 7 · 1⤊ 0⤋

Binomial probability: P(2 are right-handed) = P(1 is left-handed) = C(3, 1) (0.1)^1 (0.9)^2 = 3(0.1)(0.81) = 0.243.

2007-06-12 22:31:58 · answer #2 · answered by Scarlet Manuka 7 · 0⤊ 0⤋

.066666666666666666667

10% of 2/3

2007-06-12 22:31:17 · answer #3 · answered by Anonymous · 0⤊ 2⤋