Statistic Help Please. (1 Viewer)

[rr.dun.dun]

ive been stuck on this question and i cant workout which numbers im supposed to use and if im supposed to be x 10 or not.

anyway. the question is find the mean. .

its a graph. and on the veritcal side is the frequency and horizontal is the wages from part-time jobs (x10)

i cant draw it up. but here is a table for it. .

Frequency | Wages (x10)

9 | 6

14 | 8

10 | 10

18 | 12

16 | 14

8 | 16

7 | 18

10 | 20


if you dont get it. .thenn can you tell me if im supposed to do it by x10 or how do i do it to get the mean which is the sum of all the scores divided by how many there are altogether. .

thanks.

 

[rr.dun.dun]

ANYONEEEEEEEEEEEEEEEEEEEEEEEE HELP? lol.

 

[PC]

You've probably got it set out in a really poor way.

It might be better to look at it like this:

Wages (x $10): 6, 8, 10, 12, 14, 16, 18, 20
Frequency: 9, 14, 10, 18, 16, 8, 7, 10

The easiest way is to use a graphics calculator.
Put Wages in List 1 and Frequency in List 2.
The mean works out to be 12.6086956.
This means that the average wage is $126.09.

If you're doing it by hand, first add up the total frequency.
9 + 14 + 10 + 18 + 16 + 8 + 7 + 10 = 92

Next add up all the wages:
(6x9)+(8x14)+(10x10)+(12x18)+(14x16)+(16x8)+(18x7)+(20x10)=1160

So the average is 1160 ÷ 92 = 12.6086956
This means that the average wage is $126.09.

 

[rr.dun.dun]

omgggg. im so stupid. i did the first part with the wages and then the frequency screwed me up. thanks so much lol.

 

[rr.dun.dun]

do you know how to type it in the calculator for standard deviation? because its divided by the frequency total not the number of wages.

 

[PC]

Graphic Calculator is easy. Every possible result comes up in the "Calculation" display.

If you're using a scientific calculator, then it depends on the model you have. Standard deviation could be anything. On most Casio models, it's Shift-2, or some variation on that.

 

[rr.dun.dun]

oh no. i have a scientific calculator. i know what to press to access where it calculates the wages. but it comes up in a table of just x. and you have to type it in. what am i supposed to type in?

 

[rr.dun.dun]

???????