Use Table A or software. Use Table A or software to find the value of z for each of the following situations. In each case, sketch a standard Normal curve and shade the area representing the region.

(a) Twelve percent of the values of a standard Normal distribution are greater than z.

(b) Twelve percent of the values of a standard Normal distribution are greater than or equal to z.

(c) Twelve percent of the values of a standard Normal distribution are less than z.

(d) Fifty percent of the values of a standard Normal distribution are less than z.