The gestation time for humans has a mean of 266 days and a standard deviation of 25 days. If 200 women are randomly selected, find the probability that they have a mean pregnancy between 266 days and 268 days.

The probability that 200 women have a mean pregnancy between 266 days and 268 days is 0.371.

Explanation:

Let X = gestation time for humans.

The mean of the random variable X is: E (X) = μ = 266 days.

The standard deviation of the random variable X is: SD (X) = σ = 25 days.

**Assume that the gestation time for humans follows a Normal distribution.

The z-score for the sample mean is: .

The sample of women selected is: n = 200.

Compute the probability that 200 women have a mean pregnancy between 266 days and 268 days as follows:

**Use the z-table for the probability.

Thus, the probability that 200 women have a mean pregnancy between 266 days and 268 days is 0.371.

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i guess you forgot putting it.

answer: ice crystals in air

the water from the water body or another source of water gets evaporated as water vapor as an effect of heat on water. these water vapor rises in the upper layers of the earth atmosphere under high atmospheric pressure. the atmospheric pressure of these water molecules starts to decrease due to the effect of cold air. the invisible water vapor condenses into visible water droplets and ice crystals.these ice crystals and water droplets being less denser than the surrounding air floats on air as clouds.