The probability that Sandra gets a ride to work on any morning is 0.7. The probability that she gets a ride 3 times in a 5-day work week is __, and the probability that she gets a ride at least 2 times in a 5-day workweek is __.

We are given with

p = 0.7

and

q = 1 - p = 1 - 0.7 = 0.3

The first condition is

she gets a ride 3 times in a 5-day work week

The solution is

P = ₅ C ₃ (0.7) ³ (0.3) ²

Solve for P

The second condition is

the probability that she gets a ride at least 2 times in a 5-day

The solution is

P = Σ ₅Ci (0.7) ^i (0.3) ^ (5-i)

with i from 2 to 5

Solve for P