Find the probability of at least 2 girls in 5 births. assume that male and female births are equally likely and that the births are independent events.

round your answer to four decimal places.

Respuesta :

keu
Probability of at-least 2 girls = Probability of 2 girls + Probability of 3 girls + Probability of 4 girls + Probability of 5 girls = 1 - (Probability of no girl + probability of 1 girl)

We know:

probability when no girl = 5C0 * (1/2)^0 *(1/2)^5 = 0.03125
probability when one girl = 5C1 * (1/2)^1 *(1/2)^4 = 
0.15625

probability when at least 2 girls = 1-(0.03125+
0.15625
= 0.8125(approx)