7. (a) In a study carried out in a college, one out of three students surf the
internet everyday.

If a sample of 57 students is selected randomly from the college, calculate
the mean and standard deviation of the number of students that surf the
internet every day.

the range is 19

step-by-step explanation:

the range is biggest number minus the smallest, so in this case it would be

41 - 22 = 19

4/6 = 2/3

so it should take 3/3 hours per man. so 9 hours is the answer 3*3 =9

step-by-step explanation:

you can first factor out the n to get n(1+5). we know that 1+5 is 6, so we just have 6n.

yes.. it's proven to be 36.