Solution:
n = 25
= 1050
= 200
( A )
P( > 1126 ) = z ( / )
= P( z > ( 1126 - 1050 )/(200/) )
= P( z > 79 / 40 )
= P( z > 1.975 )
= 0.0239
( B )
P( < 966 ) = z ( / )
= P( z < ( 966 - 1050 )/(200/) )
= P( z < -2.1 )
= 0.0179
( C )
P( > 1046 ) = = z ( / )
= P( z > ( 1046 - 1050 )/(200/) )
= P( z > -0.1)
= 0.5398
1 pt) A P(X1126) Probability B. P(X < 966) Probability c. P(X > 1046) Probability
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