Q: How do you find missing number if the mean is given?

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You cannot.

22.4

If there is no mean given, you can try finding the median of the data set. The median is the middle value when the data set is sorted in ascending order. If the data set has an even number of values, the median is the average of the two middle values. If the missing number is the median, finding the median will help you identify it.

geometric means like find the missing number and algebraic means negatives and positves

You cannot. You can only work with the remaining observations. Estimating the missing value will not add to the information. You will only APPEAR to have an additional piece of information.

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Convert it.

you have to count up all of the addends

You cannot.

Add all the numbers and divide it by however many numbers you added, then that's how you get the missing number to help you complete the mean.

The mean times three will be the total of all three numbers. Multiply the mean times three and subtract the sum of the two numbers from that total.

22.4

If there is no mean given, you can try finding the median of the data set. The median is the middle value when the data set is sorted in ascending order. If the data set has an even number of values, the median is the average of the two middle values. If the missing number is the median, finding the median will help you identify it.

a number

geometric means like find the missing number and algebraic means negatives and positves

You cannot. You can only work with the remaining observations. Estimating the missing value will not add to the information. You will only APPEAR to have an additional piece of information.

a missing number

If you mean: 60, 48 .... 24 then the missing number is 36