1) P( -2.86 < Z < 1.62)
= P(Z < 1.62) - P(Z < -2.86)
= 0.9474 - 0.0021
= 0.9453
2) P(Z < c) = 0.544
From standard normal distribution table
P(Z < 0.1105) = 0.544
So
c = 0.1105
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