We have been given that the standard deviation of a group of 20 scores is 15 and we are asked to find variance.
Since we know variance is square of standard deviation. In order to find out the variance of the given data we have to take the square of 15.

Therefore, our variance is 225.
First, change the measurements of the pole to m so all of the units are the same.
41 cm=.41 m
72 cm=.72 m
Then, let x represent the height of the building
30/x=.72/.41
x=30*.72/.41
x=52.68 m
round to 52.7 m
Answer:
286 miles / x gallons = 15miles per gallon.
286/15 = x = approximately 19.07 gallons.
Step-by-step explanation:
Answer:
9991
Step-by-step explanation:
103 × 97
(100 +3) (50+47)
get two number which you can add to get the value in the question
n then expand
100(50+47) +3(50+47)
5000+4700+150+141
9991