The mean of a list of test scores is 80. Adding an additional test score of 92 caused the mean to rise to 82. After this additional, how many total test are in the list

6

Step-by-step explanation:

The mean of a list of test scores is 80

Adding an additional test score of 92 caused the mean to rise to 82

To find:

After this additional, how many total test are in the list ?

Solution:

Let the total number of test at first =

And sum of total score =

As we know, mean =

Multiplying both sides by

Now, as adding an additional test score of 92 caused the mean to rise to 82,

By dividing both sides by minus ( - )

By dividing both sides by 2

Thus, total number of test at first = = 5

And, after this additional score added, total number of tests are

from the figure we get,

the x axis shows   the months and,

the y-axis shows the number of satisfied customer.

each line or each cell in upward direction (y-axis) shows 500.

the appropriate scale for the y - axis is: -

a = 2000 customers

b = 4000 customers

c = 6000 customers

d = 8000 customers

e = 10000 customers

f = 12000 customers

g = 14000 customers

4

step-by-step explanation:

6 (donuts) divided by 3 is 2.

so 2/3 means 2 times 2, which is 4/6.

you get two and your friend gets four.