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30 September, 23:37

The weight of strawberries follows a normal distribution with a mean weight of 12 grams and a standard deviation of 2.5 grams. If a strawberry is randomly selected, what is the probability that the strawberry weighs less than 9 grams? A ...2033

B ...1587

C ...0179

D ...1151

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  1. 30 September, 23:56
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    Let X be a random variable representing the weight of strawberries.

    P (X < 9) = P (z < (9 - 12) / 2.5) = P (z < - 3/2.5) = P (z < - 1.2) = 1 - P (z < 1.2) = 1 - 0.88493 = 0.1151
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