Human gestation times from conception to natural birth follow an approximate Normal distribution with a mean of 266 days and a standard deviation of 16 days. What proportion of pregnancies will last 255 days or fewer?
Added by Victor Manuel W.
Step 1
To convert the given information into a standard normal distribution, we need to calculate the z-score for the value of 255 days using the formula: z = (x - μ) / σ where: x = the value we want to convert (255 days) μ = the mean of the distribution (266 days) σ Show more…
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