Answer:
Below.
Step-by-step explanation:
To find the number of students in each grade you multiply the marks by the frequency density. The number of students is given by the area under the rectangles.
So to find the number of students with grade U (< 160) it is:
120 * 0.2 + 40*0.5
= 24 + 20
= 44.
The number for Grade E
= (200 - 160) * 0.5
= 40 * 0.5
= 20.
The others can be found in the same way.
X= 10 y= 9 the difference between the two numbers is one and they equal 19
Answer:
2 1/2 = 5/2
Step-by-step explanation:
There is a trick you can do when converting mixed numbers into improper fractions
Multiply the whole number and denominator, in this case you'll do 2 * 2 which equals 4
Finally, add the numberator to your product. For this you'll do 4 + 1 which equals 5
When done, keep the denominator and keep your sum as the numerator. 5/2!
Answer:
-12x+24
Step-by-step explanation:
3(-4x+8)
multiply 3 by each part so 3(-4x) + 3(8)
-12x+24
Answer:
A =315 cm^2
Step-by-step explanation:
The area of a trapezoid is found by
A = 1/2 (b1+b2) *h
where b1 and b2 are the lengths of the bases and h is the height
A = 1/2 ( 13+29) *15
A = 1/2 (42)* 15
A =315 cm^2
