PLEASE HELP IM BEING TIMED I WILL MARK BRAINLY
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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.
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from the question given, the dog walker charges a flat rate of $6 and an extra $30 per hour.
we can write out an equation in function notation
let the number of hours be represented by x
now we can proceed to solve the cost of the walk for 45 minutes
now we can input the value into the equation and know the cost for 45 minutes walk
from the calculation above, the cost of 45 minutes walk will cost $28.5