4.14. If z is the positive number such that the interval from fx - zo-o fx +...

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4.14. If z is the positive number such that the interval from fx - zo-\o fx + z

(a) Which percentile is (i) /x + ztr? (ii) /x — ztr?

(b) Find this value of z-

(c) Using this result, explain why the upper quartile and lower quartile of a normal distribution are ix + 0.67o- and ix - 0.67tr.

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