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10 September, 11:26

If a seed is planted it has a 75% chance of growing into a healthy plant. If 7 seeds are planted what is the probability that exactly 4 don't grow

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  1. 10 September, 13:20
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    NCr*P^r*q^ (n-r)

    7C4*. 75^4*. 25^ (7-4)

    35*. 75⁴*. 25³

    35*. 316*. 016

    11.06*. 016

    . 1769

    =. 177
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