The systolic blood pressure of the patients at a hospital are

The systolic blood pressure of the patients at a hospital are normally distributed with a mean of 140mm Hg and a standard deviation of 13.1 mm Hg. Find the two blood pressure having these properties; the mean is midway between them and 90% of all blood pressures are between them.
A) 123.2 mm Hg, 156.8 mm Hg
B) 128.2 mm Hg, 151.8 mm Hg
C) 118.5 mm Hg, 161.5 mm Hg
D) 119.5 mm Hg, 162.5 mm Hg

5) The annual precipitation amounts in a certain moutain range are normally distributed with a 5) ____________ mean of 17 inches and a standard deviation of 12 inches. What it the probability that the mean annual precipitaion during 36 randomly picked years will be less than 109.8 inches?
A) 0.9192
B) 0.5808
C) 0.0808
D) 0.4192

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