14. Given a standard normal distribution, find: (For full credit need to draw the curve and...

Question

Question

14. Given a standard normal distribution, find: (For full credit need to draw the curve and shade the area)

a) P(−1.13 < z < 3.11).

b) P (0.21 < z < 0.81).

math Statistics-And-Probability

Answer 1

Answer #1

P(−1.13 < z < 3.11).

= P(Z <3.11 ) - P(Z <-1.13 )

Using z table

= 0.9991 - 0.1292

probability= 0.8699

b.

P (0.21 < z < 0.81).

P(Z <0.81 ) - P(Z <0.21 )

Using z table

=0.791 - 0.5832

=0.2078

Answer 2

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