12% of ___ shirts is 36 shirts

300 shirts

Step-by-step explanation:

You can divide 12% by itself to find one percent, then divide the 36 shirts by 12 as well.

What you do to one side, you need to do to the other.

Now that we have our numbers after dividing (you should have 1% and 3 shirts) you can see what 100% would be. To do this you would multiply 1% by 100 and multiply 3 shirts by 100.

Now we know that 12% of 300 shirts is 36 shirts.

132.5

Step-by-step explanation:

First, find the mean of the numbers given.  To calculate the mean, or average of any number set, add up all the numbers in the set and then divide that sum by the number of numbers in the set.

The mean of this given data is:

add up all the numbers: 147+141+120+124+128=660

there are 5 numbers in the set, so divide the sum by 5: 660/5=132

The next step in finding the difference is to subtract the mean from each number and square each resulting difference.

147-132=15^2=225

141-132=9^2=81

120-132=(-12)^2=144

124-132=(-8)^2=64

128-132=(-4)^2=16

Finally, find the mean, or average, of the squared difference.

add them all up: 225+81+144+64+16=530

the only difference with the division is that the divisor is the number of numbers minus 1, so in this case 5-1, which equals 4

so, now divide: 530/4=132.5

So, the variance of the given data is 132.5