Question: a . P ( x = 6 5 ) z = ( 6 5 - 7 2 ) / ( 6 ) = - 1

a. P(x=65)
z=(65-72)/(6)=-1.17=>.1210
b. z=(70-72)/(6)=-.33=>.3707
z=(60-72)/(6)=-2=>=.0228
c. P(x>=75)
z=(75-72)/(6)=.5=>.6915=>1-.6915=.3085
can someone breakdown how my teacher got this answer?
a . P ( x < = 6 5 ) z = ( 6 5 - 7 2 ) / ( 6 ) = -

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