McKenzie S. answered • 10/05/17

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x = 18.5

μ = 26.8

σ = 7.4

P(X < x) = P[(X-μ)/σ < (x-μ)/σ]

P(X < 18.5) = P[Z < (18.5 - 26.8)/7.4] = P(Z < -1.12)

From the table of normal distribution for z = -1.12, we get

**0.131357**.