It cost Erica $9.75 for the ingredients to make 30 cupcakes. She sold them for $1.00 each. What was Erica’s total profit?
1 answer:
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SOLUTION
The mean is 4min
standard deviation is 1min
the z score is
where
then we have
The probability the call lasted less than 3 min will be
Therefore, the probability that (z < -1 ) is
[tex]\begin{gathered} Pr(z<-1)=Pr(0Hence, the percentage of the calls that lasted less than 3 min is 16%
<u>ANSWER</u>
<u>EXPLANATION</u>
Given
and
We want to find
This means we substitute the function in to another function
and evaluate.
This implies that;
We expand the parenthesis to obtain;
We simplify further to obtain;
Hence the correct answer is A