02-06-2018
Mathematics

contestada

Find the probability that 4 students chosen at random are all born on a Wednesday.
A) 1/28
B) 1/2401
C) 4/2401
D) 1/254

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jimthompson5910 jimthompson5910

02-06-2018

Answer is choice B) 1/2401

The probability any individual is born on a Wednesday is 1/7.
There are four of these individuals, so we multiply out the fraction four times
(1/7)*(1/7)*(1/7)*(1/7) = (1/7)^4 = (1^4)/(7^4) = 1/2401

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