Five coins are tossed 3200 times. The expected number of times we get exactly two heads is

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Five coins are tossed 3200 times. The expected number of times we get exactly two heads is

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600

2000

1500

1000

answer is B.

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Detailed Solution

$X = getting a head when a coin is tossed$

$p = q = \frac{1}{2}, n = 5 \Rightarrow P (X = 2) =^{5} C_{2} {(\frac{1}{2})}^{5} = \frac{10}{32} = \frac{5}{16}$

$3200 . P (x = 2) = 3200 (\frac{5}{16}) = 1000$

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