Answer:
A. P(X ≤ 42) ≈ 0.2623
Explanation:
You want a shaded graph and the probability that X ≤ 42 for a normal distribution with μ = 49 and σ = 11.
Shading
The meaning of X ≤ 42 means values of x from -∞ to 42 are of interest. The graph will be shaded to the left of the point where X = 42.
Probability
The area of the normal curve that has this shading is found using the cumulative normal probability distribution function. A calculator gives the value as P(X ≤ 42) ≈ 0.2623. (Check your typing.)
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