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A fair coin is tossed 3 times. The probability of throwing 3 tails = 0.125, two tails = 0.375 and 1 tails = 0.375. What is the probability of throwing 1 head?

1 Answer

May 10, 2018

0.375

Explanation:

You could throw

HTT $= \frac{1}{2} \times \frac{1}{2} \times \frac{1}{2} = \frac{1}{8}$ $=1/2 xx 1/2 xx 1/2=1/8$

THT $= \frac{1}{2} \times \frac{1}{2} \times \frac{1}{2} = \frac{1}{8}$ $=1/2 xx 1/2 xx 1/2=1/8$

TTH $= \frac{1}{2} \times \frac{1}{2} \times \frac{1}{2} = \frac{1}{8}$ $=1/2 xx 1/2 xx 1/2=1/8$

$\frac{1}{8} + \frac{1}{8} + \frac{1}{8} = \frac{3}{8} or 0.375$ $1/8 + 1/8 + 1/8 = 3/8 or 0.375$

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