Question: 4.9. For a normally distributed variable, verify that the probability between: (a) fi - a and /x + a equals 0.68 (b) fx 1.96(r

4.9. For a normally distributed variable, verify that the probability between:

(a) fi - a and /x + a equals 0.68

(b) fx — 1.96(r and/x + L96(t equals 0.95

(c) /x — 3o- and /x + 3(r equals 0.997

(d) /x — 0.67(7 and /x + 0.67(7 equals 0.50

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