if the mean of these numbers (20,15,32,18) is 21 what is the missing number?
5 * 21 = 105
The sum of your numbers is 85.
105 - 85 = ?
To find the missing number, we can use the concept of the mean (also known as the average).
The mean is calculated by summing all the numbers in a set and dividing the sum by the total number of values.
Let's break down the problem step by step:
Step 1: Find the sum of the given numbers.
20 + 15 + 32 + 18 = 85
Step 2: Find the total number of values given.
Since there are four numbers in the set (20, 15, 32, 18), the total number of values is 4.
Step 3: Calculate the mean by dividing the sum by the total number of values.
Mean = Sum / Total number of values
Mean = 85 / 4
Mean = 21.25
The mean of the given numbers is actually 21.25, not 21. This means there might be a mistake in the information provided.
Since the mean is 21.25, we cannot determine the exact missing number without more information.
If you suspect that one of the numbers provided is incorrect, you can try re-calculating the mean by substituting each number one by one. For example, you can use 20, 15, 18, and the missing number to see if the mean is 21. If it is, then the missing number is 32. If not, there might be an error in the given information or calculations.
105-
85
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20
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