68% of the pizzas are delivered between 24 and 30 minutes
Step-by-step explanation:
First we calculate the Z-scores
We know the mean and the standard deviation.
The mean is:
The standard deviation is:
The Z-score formula is:
For the Z-score is:
For the Z-score is:
Then we look for the percentage of the data that is between deviations from the mean.
According to the empirical rule 68% of the data is less than 1 standard deviations of the mean. This means that 68% of the pizzas are delivered between 24 and 30 minutes
The answer is $162 you take the prices of what she bought and add them together which is $73+$38+$64=$180 then you subtract the $180 from $342 which is $342-$180=$162 so the answer is $162