The average height of 3 students is 68 inches. If 2 of the students have heights of 70 inches and 72 inches respectively, thenw hat is the height (in inches) of the third student?
62
3 * 68 = 204
204 - (70 + 72) = ?
To find the height of the third student, we can use the formula for average.
Average is calculated by adding up all the values and then dividing the sum by the number of values.
So, in this case, the average height of the 3 students is given as 68 inches.
We know the heights of 2 of the students, which are 70 inches and 72 inches.
Let's call the height of the third student 'x'.
To calculate the average, we add up all the heights and divide by 3 (the total number of students).
So, the equation becomes:
(70 + 72 + x) / 3 = 68
Now, we need to solve for 'x'.
First, we multiply both sides of the equation by 3 to eliminate the denominator:
70 + 72 + x = 68 * 3
Simplifying, we get:
142 + x = 204
Next, we can isolate 'x' by subtracting 142 from both sides of the equation:
x = 204 - 142
Calculating, we find:
x = 62
Therefore, the height of the third student is 62 inches.