A variable has a normal distribution with a mean 67 and standard deviation 4. What is the probability that the variable takes a value between 63 and 71?
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We need to standardize the values of 63 and 72 using the formula: z = (x - μ) / σ where x is the value we want to standardize, μ is the mean, and σ is the standard deviation. For 63: z = (63 - 67) / 4 = -1 For 72: z = (72 - 67) / 4 = 1.25 Show more…
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