probobility maths word problem help on A AND B please

Question

when Jake catches the bus to school in the morning, it may be early, on time or late. 

The probability that it is early is 0.05

The probability that it is late is 0.4

 

-------------------------------------------------------------------------------------------------------------------------------------------

 

(A)what is the probability that the bus is on time

 

-------------------------------------------------------------------------------------------------------------------------------------------

 

(B)calculate how many times you would expect the bus to be late in a school year of 190 days

Answer 1

(a) Sum of all probabilities is 1. So,

probability it is on time = 1 - 0.05 - 0.4 = 0.55

 

(b) 190 x 0.4 = 76