Question: 4.11. Find the z-value such that for a normal distribution the interval from /t - zcr to jtx + zo- contains (a) 50% (b) 90%

4.11. Find the z-value such that for a normal distribution the interval from /t - zcr to jtx + zo- contains

(a) 50%

(b) 90%

(c) 95%

(d) 98%

(e) 99% of the probability.

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