Question

What is the probability of getting exactly 2 heads on rolling 5 coins in r

Answer 1

Answer:

5 / 16 = 0.3125

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Step-by-step explanation:

With 5 coin tosses, there are 2⁵ = 32 possible outcomes.

The number of ways to have exactly 2 heads

= # ways of choosing 2 positiions from 5 that would be the heads

= ( 5 × 4 ) / ( 2 × 1 ) = 10

[ or use Pascals Triangle; the sixth row is 1 5 10 10 5 1 ]

So

P(exactly 2 heads)

= ( # ways of having exactly 2 heads ) / ( # possible outcomes )

= 10 / 32

= 5 / 16

= 0.3125