The tutor charges $40 plus $30 for each student in the group. Today the tutor has works with a group of students students and charges a total of $220.

Step-by-step explanation:

I think you want to find out how many students there are.

Lets subtract the fees, which is $40, for a start

220-40=$180

to find the number of students in the group lets divide 180 by the fees of each student

180/30=6

there are 6 students in the group

an advantage of the standard deviation is that it increases as the dispersion of the data increases. e. the interquartile range is preferred when the data are not skewed or no have outliers. an advantage of the standard deviation is that it uses all the observations in its computation.

687.09 dollars       happy now

step-by-step explanation: 6870

1857 times .63 equals 1169.91 subtract that from 1857 you get 687.09