three coins are tossed simultaneously 150 times with the following frequencies of different outcomes
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No. of tails Frequency
0 25
1 30
2 32
3 63
a. P(exactly 1 tail) = 30/150 = 1/5
b. P(at least 2 tails) = P(2 tail) + P(3 tail)
= 32/150 + 63/150
= (32 + 63)/150
= 95/150
= 19/30
c. P(at most 3 tail) = P(0 tail) + P(1 tail) + P(2 tail) + P(3 tail)
= 25/150 + 30/150 + 32/150 + 63/150
= (25 + 30 + 32 + 63)/150
= 150/150
= 1
d. P(exactly 3 heads) = P(0 tail) = 25/150 = 1/6
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