(a) using table, Z for 0.879 equals 1.17;
(b) P(−1.61 < Z < k) =0.8958.
table(k) - table(−1.61) = 0.8958
table(k) - 0.0537 = 0.8958
table(k) = 0.8958+0.0537=0.9495
from area table
k = 1.64
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