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Maths problem

I need help solving this question:

Altogether, I have 10 bags of sweets.
The mean number of sweets in the bag is 42.
The number of sweets that appear in each bag has been shown below:

number of sweets: Frequency:
39 1
40 2
41 5
42 0
43 1

How many sweets are in the tenth bag?
Reply 1
Avatar for mqb2766
mqb2766
21
The number of sweets in tenth bag must be
total number of sweets - total in other nine bags
use the info in the question to get these two totals, the n subtract.
Reply 2
Avatar for SIP2006
SIP2006
OP
4
Original post by mqb2766
The number of sweets in tenth bag must be
total number of sweets - total in other nine bags
use the info in the question to get these two totals, the n subtract.

This hasn't helped at all, the answer that I'm getting ( 40.7) is incorrect according to the website I'm using.
Reply 3
Avatar for SIP2006
SIP2006
OP
4
Here's a picture of the problem
Mathswatch.png74.7KB
Reply 4
Avatar for mqb2766
mqb2766
21
Original post by SIP2006
This hasn't helped at all, the answer that I'm getting ( 40.7) is incorrect according to the website I'm using.

Maybe show your working? Can you work out the total number given the average and the number of bags?
The answer must be a whole number of sweets.
Reply 5
Avatar for niagg
niagg
2
1.JPG
Original post by SIP2006
I need help solving this question:

Altogether, I have 10 bags of sweets.
The mean number of sweets in the bag is 42.
The number of sweets that appear in each bag has been shown below:

number of sweets: Frequency:
39 1
40 2
41 5
42 0
43 1

How many sweets are in the tenth bag?

Calculate the mean of the sweets from the bags you know, you can then compare the two means and work out the difference. This should allow you to calculate the final bag.
Reply 7
Avatar for mqb2766
mqb2766
21
Original post by Viktring
...

Original post by niagg
...

Forum rules say hints not solutions. Pls delete.
Reply 8
Avatar for Viktring
Viktring
1
Original post by SIP2006
I need help solving this question:

Altogether, I have 10 bags of sweets.
The mean number of sweets in the bag is 42.
The number of sweets that appear in each bag has been shown below:

number of sweets: Frequency:
39 1
40 2
41 5
42 0
43 1

How many sweets are in the tenth bag?

Work out the total number of sweets in the nine bags = (1 x 39) + . . . = Z

Let the number of sweets in the tenth bag be N. You are told the mean number of sweets in ten bags is 42, which you can express mathematically as an equation: (Z + N)/10 = 42. You should be able to rearrange this equation to find N.

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