The number of litres of petrol purchased by a random sample of motor vehicle drivers is shown below: Questions:
a)Find the mean
b)Find the standard deviation
c)Find the unbiased estimates of the mean and variance for the population this sample comes from.

Quadrilateral efgh was dilated with the origin as the center of dilation to create quadrilateral e'f'g'h'. the quadrilateral was dilated using a scale factor of 2.5. the lengths of the sides of quadrilateral efgh are given. what is the length of side f'g'?