Question

1. What is the lower limit of the class 50-60?

2. What is the upper limit of the class 70-80

3. Calculate the class- mark of the second class interval (40-50)

4. What is the class-size?

5. How many students are below 60 marks?​

Answer 1

Answer:

1. What is the lower limit of the class 50-60?

☞ 50

2. What is the upper limit of the class 70-80 ?

☞ 80

3. Calculate the class- mark of the second class interval (40-50)

$☞ \tt class \: mark \: = ( \dfrac{upper \: limit - lower \: limit}{2} )$

$</p><p>☞ \tt \dfrac{40 + 50}{2} = \dfrac{90}{2} = 45$

4. What is the class-size?

☞ Class size = Upper limit - Lower limit

☞ Class size = 50 - 40

☞ class size = 10

5. How many students are below 60 marks?

☞ the number of students who have scored below 60 marks will be in the interval of 30-40 , 40-50 , 50-60

☞ 30-40 + 40-50 + 50-60

☞ 12 + 13 + 4 = 29

Answer 2

Answer:

☞ 50

☞ 80

☞ 45

☞ class size = 10

☞ 29