- #1
Noobnoobnoob
- 2
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Ok I've got a maths exam on monday and one of the things that is going to be inside it is standard deviation.
Problem is I don't get it one bit. I tried googling it but I didn't understand any of it.
Could someone explain to me how I would find the estimated standard deviation for the following data please?
Profits (1000s)--------Frequency
-10<x<10------------2
0<x<10---------------5
10<x<20-------------12
20<x<30-------------20
30<50-------------61
The formula is
Square root off (Total (x-mean of x) squared divided by n but I don't get what x and n are.
The estimated mean is 31350
Please help
Problem is I don't get it one bit. I tried googling it but I didn't understand any of it.
Could someone explain to me how I would find the estimated standard deviation for the following data please?
Profits (1000s)--------Frequency
-10<x<10------------2
0<x<10---------------5
10<x<20-------------12
20<x<30-------------20
30<50-------------61
The formula is
Square root off (Total (x-mean of x) squared divided by n but I don't get what x and n are.
The estimated mean is 31350
Please help