1.

1). 3/42). 1/43). 1/24). 1

Answer»

We know that,

The Sample Space S = {5 + 5 + 5(HHH), 5 + 10 + 5(HTH), 5 + 5 + 10(HHT), 5 + 10 + 10(HTT), 10 + 5 + 5(THH), 10 + 10 + 10(TTT), 10 + 10 + 5(TTH), 10 + 5 + 10(THT)} = {15, 20, 20, 25, 20, 30, 25, 25}

The event E of sum being less than or equal to 20 = {15, 20, 20, 20}

Probability P(E) = n(e)/n(s) = 4/8 = 1/2

∴ the probability of the sum being less than or equal to 20 is 1/2.



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