SOLUTION: The mean height of 5 students is 58. If one of the students leaves, the mean height becomes 56.75. What is the height of the absent student?
Algebra ->
Probability-and-statistics
-> SOLUTION: The mean height of 5 students is 58. If one of the students leaves, the mean height becomes 56.75. What is the height of the absent student?
Log On
Question 473669: The mean height of 5 students is 58. If one of the students leaves, the mean height becomes 56.75. What is the height of the absent student? Answer by oberobic(2304) (Show Source):
You can put this solution on YOUR website! The mean = sum / count.
Substituting what we know:
58 = x / 5
Multiply both sides by 5 to eliminate the fraction
290 = x
Equals are equal, so we can say:
x = 290
.
What else do we know?
One student left and mean height is 56.75.
56.75 = x / 4
Multiply both sides by 4
227 = x
x = 227
.
So, how tall was the person who left?
.
290 - 227 = 63 inches
63 inches = 5 ft 3 in
.
Done.
(