is and
so if , then
this implies that
which implies that
indeed, you might be right..
try checking this.. Z table - Normal Distribution
Let X follow a normal distribution
mean=80 and Var=100
the probability is 0.08 that X is in the symmetric interval about the mean between which two numbers?
I did:
P( a <x< b)= .08
a= mean - k
b= mean + k
P( -k/stand dev < Z< k/st dev) =.08
F(k/st dev)- F(-k/st dev) =.08
F(k/st dev) - [ 1- F(k/ st dev)]= 0.08
2F(k/st dev)=1.08 from which k= 1 and a= 79
but the result on the book is a= 62.5
Help me, please. Thank you
is and
so if , then
this implies that
which implies that
indeed, you might be right..
try checking this.. Z table - Normal Distribution