Question

Over 8 days,the price of a share of XYZ Company stock fell $72.On the ninth day,the price rose $4, but on the tenth day, it fell $12.Write and find the value of an expression for an average change in the price of the stock for 10 Days.

Answer 1

- $ 8

Explanation:

Given,

The price of share of the company fell $ 72 over 8 days,

i.e., the changes for 8 days = -$ 72,

Now, it rose $ 4 on ninth day,

i.e., the changes for 9th day = +$ 4,

Again it fall $ 12 on tenth day,

i.e., the changes on 10th day = -$12,

So, the total changes in 10 days = changes for 8 days + change for 9th day + change for 10th day

= -72 + 4 - 12

= -$ 80

Now, we know that,

`\text{Average}=\frac{\text{Sum of all observation}}{\text{Total observations}}`

Hence, the average change in 10 days =
`(-80)/(10)` = -$ 8

Answer 2

(- 72 +4 -12)/10

-80/10

-8

The stock fell an average of $8.00 per day