ForX

X

normal with

=

10

=10

,

=

15

=15

and a sample size of 42,P

(

X

<

7

)

=

P(X<7)=

Note: round yourz

z

score to two decimals places

• 0.5793.
• 0.9032.
• 0.0968.
• 0.4207.
• none of the above.