To find the fourth number, we can use the formula for the mean:
Mean = (sum of all the numbers) / (total number of numbers)
We can substitute the given values:
30 = (12 + 50 + 48 + x) / 4, where x is the fourth number we're looking for.
Multiplying both sides by 4 gives:
120 = 12 + 50 + 48 + x
Simplifying, we get:
x = 120 - 12 - 50 - 48
x = 10
Therefore, the fourth number is 10.
Quick check:
We can verify that the mean of all four numbers is indeed 30 by adding them up and dividing by 4.
(12 + 50 + 48 + 10) / 4 = 30
So, the answer is option B, 10.
The mean of four numbers is 30 if three of those numbers are 12,50,and 48 what is the fourth number?
120
10
12
30
Mean and , outliers, quick Chek
1 answer