We have to define an interval about the mean that contains 75% of the values. This means half of the values will lie above the mean and half of the values lie below the mean.
So, 37.5% of the values will lie above the mean and 37.5% of the values lie below the mean.
In a Z-table, mean is located at the center of the data. So the position of the mean is at 50% of the data. So the position of point 37.5% above the mean will be located at 50 + 37.5 = 87.5% of the overall data
Similarly position of the point 37.5% below the mean will be located at
50 - 37.5% = 12.5% of the overall data
From the z table, we can find the z value for both these points. 12.5% converted to z score is -1.15 and 87.5% converted to z score is 1.15.
Using these z scores, we can find the values which contain 75% of the values about the mean.
z score of -1.15 means 1.15 standard deviations below the mean. So this value comes out to be:
150 - 1.15(25) = 121.25
z score of 1.15 means 1.15 standard deviations above the mean. So this value comes out to be:
150 + 1.15(25) = 178.75
So, the interval from 121.25 to 178.75 contains the 75% of the data values.
Step-by-step explanation:
wall 25×12=300
2 walls = 600
wall2 20×12=240
2 wall2= 480
600+480= 1080 sq ft
Answer:
83/100
Step-by-step explanation:
You move 2 times to the right your answer will be 83/100
Answer: 1,612 eggs
Step-by-step explanation:
Alex has a total of 806 dinosaurs. He also has twice as many eggs as he does dinosaurs.
The number of eggs is therefore:
= Number of dinosaurs * 2
= 806 * 2
= 1,612 eggs
Salutations!
How do you find the area of a triangle
To find the area of a triangle, you need to know the formula of the triangle to work it out. The following is the formula of the triangle:
H - height
B- Base
You need to multiply the base and height and divide it by 2.
Lets solve a question!
Find the area of a triangle with a base of 32mm and a height
of 35mm
Area =
=
=
=
=
Hope I helped (:
Have a great day!
