Brian goes to the bookstore to buy some books . he has $65. he wants to have at least $15 left after purchasing his books which cost $8 . write an inequality to represent the situation . ( tell me how you got the answer ) .

≤

Step-by-step explanation:

let the number of books purchased = x

cost of each book = $8

Cost incurred on books = 8x

money to be saved for miscellaneous expenses= $15

Total cost = 8x+15

We are given that total cost need to be less than or equal to $65

Hence

8x+15≤65

subtracting 15 from both sides

8x≤50

diving both sides by 8

11, 12, 15, 16, 20, 20, 25
Mean: 17

The range is 25-11 = 14 (the numbers in bold)

The interquartile range is 20-12=8 (the numbers underlined)

The mean absolute deviation is: 4; this is found by finding how far each number is from 17 (mean): 6,5,2,1,3,3,8  (28) and dividing by 7.

Part B:

The prices vary by no more that $14 (range).

The middle half of the prices vary by no more than $8 (IQR).

The admission prices differ from the mean price by an average of $4 (MAD).