Answer:
the answer would be -86.5
Step-by-step explanation:
Answer:
a) 910
b) 828100
c) 144320
Step-by-step explanation:
a. ∑y
This is the sum of all values of y. So
![\sum y = 216 + 184 + 35 + 92 + 142 + 175 + 9 + 57 = 910](https://tex.z-dn.net/?f=%5Csum%20y%20%3D%20216%20%2B%20184%20%2B%2035%20%2B%2092%20%2B%20142%20%2B%20175%20%2B%209%20%2B%2057%20%3D%20910)
b. (∑y)^2
This is the square of the sum, so the square of 910, that we found in the previous item.
910² = 828100
c. ∑y^2
This is the sum of the squares of each amount spent. So
![\sum y^2 = 216^2 + 184^2 + 35^2 + 92^2 + 142^2 + 175^2 + 9^2 + 57^2 = 144320](https://tex.z-dn.net/?f=%5Csum%20y%5E2%20%3D%20216%5E2%20%2B%20184%5E2%20%2B%2035%5E2%20%2B%2092%5E2%20%2B%20142%5E2%20%2B%20175%5E2%20%2B%209%5E2%20%2B%2057%5E2%20%3D%20144320)
Answer:
32 People
Step-by-step explanation:
I put 40 (Number of birthday cards bought previously) over 125 (Number of expected costumers) and multiplied it by 100 (Total number of card bought previously) to get my answer. Hopefully that helps :)
Answer:
21.8
Step-by-step explanation:
1.9 + 9 = 10.9
10.9 x 2 = 21.8