Question

Determine the class marks of the classes 40-45, 45-50 etc.

Answer 1

Answer:

Marks Number of student

30-35 5

35-40 8

40-45 15

45-50 20

50-55 5

55-60 4

65-70 2

70-75 3

Class mark =

2

upperlimit+lowerlimit

for 30-35 =

2

30+35

=32.5

for 35-40 =

2

35+40

=37.5

for 40-45=

2

40+45

=42.5

Step-by-step explanation:

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Answer 2

solution :-

1. 40 - 45

→ class mark = lower limit + upper limit/2

→ lower limit = 40

→ upper limit = 45

→therefore class mark = 40 + 45/2

→= 85/2 = 42.5

2. 45 - 50

→ class mark = lower limit + upper limit /2

→ lower limit = 45

→ upper limit = 50

→ therefore class mark = 45 + 50/2

→ 95/2

→ 47.5

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