Question

Probability trees. Can someone tell me how im meant to set this one out, and I can work the rest out from there

Answer 1

Explanation:

Answer 2

.8 = P (laura)

Explanation:

Sally passes is .7

both passing is .56

P(sally and laura passing) = P(sally) * P(laura)

.56 = .7 * P(laura)

Divide each side by .7

.56/.7 = .7 * P(laura)/ .7

.8 = P (laura)