9. Use the Z chart to determine z value for 0.85

According the chart this corresponds to z value of 1.04

10. P(1.50<Z<2.50) = 0.9938 - 0.9332 = 0.0606 choice B)

11. Z = 31.5 - 32 / 4/sqrt(30) = -0.5/0.73 = -0.68

P(Z<-0.68) = 0.2483

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