The mean or the average of a number is calculated by adding the frequencies of the given data and then dividing by the total frequency. It is represented by the formula mentioned under -
Mean = [tex] \frac{Sum of all the frequencies}{Number of frequencies} [/tex]
Similarly, here, we need to find the mean of their time spent in brushing.
It will be calculated as -
For Fiona
Mean of time spent in brushing = [tex] \frac{Sum of the total time spent in 10 days}{10 days} [/tex]
Similarly, for Gary
Mean of time spent in brushing = [tex] \frac{Sum of the total time spent in 10 days}{10 days} [/tex]
