Question: 3.29 Standard Normal drill. (a) Find the number z such that the proportion of observations that are less than z in a standard Normal distribution

3.29 Standard Normal drill.

(a) Find the number z such that the proportion of observations that are less than z in a standard Normal distribution is 0.2.

(b) Find the number z such that 40% of all observations from a standard Normal distribution are greater than z.

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