The grandson is 9 years old.
This would mean that the grandpa is 54.
9x6=54
54/6=9
One way to solve this problem is by:
First multiply both sides by 10
30r=9
Now divide by 30
r=0.3 Final Answer
To find which measure of variability is greater and which average number of monthly fatalities is higher, you will need to calculate the mean and the mean absolute deviation for both years
The mean will tell us which is generally higher, and the mean absolute deviation will tell us which has a greater variability.
The correct answer is D.
Please see the attached picture for the work.
Answer: 95.45 %
Step-by-step explanation:
Given : The distribution is bell shaped , then the distribution must be normal distribution.
Mean : 
Standard deviation :
The formula to calculate the z-score :-

For x = 13

For x = 19

The p-value = 

In percent, 
Hence, the percentage of data lie between 13 and 19 = 95.45 %
5/7 4/6 Do a cross multiplication 6*5 and 7*4
6*5 7*4
30 28
30 is bigger than 28. Therefore 5/7 is greater than 4/6
Yes 5/7 is greater than 4/6.
I hope it is not that complicated.