Answer:
x+2
Step-by-step explanation:
The firs 3 observations are x, x+2, x+4
Mean = sum of data/samaple size
Mean = x+x+2+x+4/3
MEan = 3x+6/3
Mean = 3(x+2)/3
Mean = x+2
Hence the required mean is x+2
Answer:
250
Step-by-step explanation:
Original cost * percent of the item = new price
Original *80% = 200
Change to decimal form
original *.80 =200
Divide each side by .80
original *.80/.80 = 200/.80
original =250
He donated 18 books per month. you first finds the difference of the books then do use the number of books by the number of months (in this case it was 5 months)
