Question

In the 2001 population census, information was collected about the number of people in each household, which is denoted by X. It is given that P(X=1)=0.25, P(X=2)=0.32, P(X=3)=0.18, P(X=4)=0.15, P(X=5)=0.07, P(X=6)=0.02 and P(X≥7)=0.01. If R is the probability that there are at most 4 people in the household, what is the value of 100R?