Question

Find the following standard normal probability: p(z > +1.23). A .1093 B .8907 C.0123 D.6093

Find the probability associated with this standard normal variable: P(z < -1.23).

	A.	.8907
	B.	.0934
	C.	.1112
	D.	.1093

Answer 1

Solution :
Using standard normla table,
1 ) P(Z > 1.23 )

= 1 - P ( Z < 1.23 )
To see the z value 0.1 in the column and 0.23 in the row of the standard normal table the corresponding probability is

1 - 0.8907

= 0.1093
Probability = 0.1093

Otion A is correct.

2 ) P(Z < - 1.23 )  
To see the z value - 0.1 in the column and 0.23 in the row of the standard normal table the corresponding probability is
Probability = 0.1093

Otion D. is correct.