14.
1. 7 × 7 = 49
2. 7 × 3 × 3 = 63
3. 7 × 3 × 4 = 84
4. 7 + 3 + 4 = 14
Hope that helps! Feel free to ask for a more explanation, if needed.
Let X be the iq score of adults. X is normally distributed with mean of 100 and standard deviation of 20.
If all iq scores are converted to z -scores then we will get z scores. And the z score is standard normal variable with mean=0 and standard deviation =1
Hence the mean and standard deviation of of all z scores will be 0 and 1 respectively.
A would be the answer because Brain might not have been paying attention to the miles so he adds a to the 5 miles he walked the next week.
The best portion to buy would be the 6 slices for you pay 95 cents per slice
the worse one to buy is the 3 slices for you pay more for less
