Question

I NEED HELP ASAP PLEASEEEE​

Answer 1

Explanation:

1) Find the Mean of all the numbers.

3+4+5+7+10+12+15=56

56/7=8 mean is 8

Now We Calculate Standard Deviation:

S=
`√((3-8)^2+(4-8)^2+(5-8)^2+(7-8)^2+(10-8)^2+(12-8)^2+(15-8)^2)`

You take each number from the problem i.e 3,4,5...

and then you subtract the mean from it and then square it.

S=
`√((-5)^2+(-4)^2+(-3)^2+(-1)^2+(2)^2+(4)^2+(7)^2)`

S=
`√(25+16+9+1+4+16+49)`

S=
`√(120)`

S=
`√(120)/7`

7 is the amount of data units given in the problem.

120/7=17.1428571429

`√(17.1428571429)` =4.1403933560541

Nearest hundredth=4.14