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.
Hdhdhdhpenishdhdhdhdhindhhdhdhyourhdhdhdhdhdhnouthdhhdhdhdh
93+(68+7)
first do what's in the parentheses
(68+7)
68+7= 75
new problem: 93+75
93+75= 168
Answer is 168
