Given the mean of 15 of them is 18 and the mean of the rest is 13
And the total numbers are 25
So,
First, we need to find the sum of all numbers
the mean of 15 of them is 18
so, the sum of the 15 numbers are = 18 * 15 = 270
The rest of the numbers = 25 - 15 = 10
the mean of the rest is 13
so, the sum of the rest = 13 * 10 = 130
so, the sum of all numbers = 270 + 130 = 400
so, the mean of the all numbers =
So, the answer is, mean = 16
The area of the trapezoid is 43.5 inches²
Step-by-step explanation:
The formula of the area of a trapezoid is , where:
∵ =
feet
∵ = 14 inches
∵ h = 3 inches
- Change the length of from feet to inches
∵ 1 foot = 12 inches
∴ feet =
× 12 = 15 inches
∴ = 15 inches
Substitute the values of ,
and h in the
formula of the area
∴
∴ A = 43.5 inches²
The area of the trapezoid is 43.5 inches²
Learn more:
You can learn more about the area of figures in brainly.com/question/12919591
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