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Assume that a randomly selected subject is given a bone density test. those test scores are normally distributed with a mean of 0 and a standard deviation of 1. find the probability that a given score is less than negative 0.76βˆ’0.76 and draw a sketch of the region.

Respuesta :

Given:
ΞΌ = 0, the population mean
Οƒ = 1, the population standard deviation

Fr the random variable x = -0.76. the z-score is
z = (x -Β ΞΌ)/Οƒ = -0.76.

From standard tables, obtain
P(x < -0.76) = 0.2236

Answer: 0.2236
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