help me please stats question I dont understand it The table

help me please! stats question, I don\'t understand it

The table displays the probabilities for each of the outcomes when three fair coins are tossed and the number of heads is counted. Find the probability that the number of heads on a single toss of the three coins is at most 2.

Solution

P(at most 2) = P(0) + P(1) + P(2) = 0.125 + 0.375 + 0.375

= 0.875 [ANSWER, OPTION C]