Class 6 Average Assignment

 Class 6 Average Assignment

Q1. A community centre has several rooms.

There are 30 chairs in each of six rooms.

There are 60 chairs in each of another 5 rooms.

Work out the mean number of chairs per room.

Ans:- Mean = Sum of obs / no. of obs = 30X6 /6 = 30

Mean = 60 X5/5 = 60

Q2. These are the masses of 7 babies.

4.2 kg 4.0 kg 4.1kg 4.5kg 4.2kg 4.3 kg 4.4 kg

A doctor writes :

The range is 4.5 - 4.2 = 0.3 kg

a) What mistake has the doctor made?

Ans- Range = Highest - Lowest Obs

the doctor take the lowest obs wrong

that is 4.0 kg

b) What is the correct answer?

Range = 4.5- 4.0 = 0.5kg

c) Work out the median mass.

Median = Middle obs

Arrange the data in asscending order

4.0 4.1 4.2 4.2 4.3 4.4 4.5

Median = 4.2 kg

Q3. Sami made 27 phone calls in 12 days.

Marta made 45 phone calls in 18 days.

a) Work out the mean number of calls per day for each person.

Sami = Mean = 27/12 = 2.25

Marta = Mean = 45/18 = 2.5

b) Who made more calls per day?

Ans:- Marta Made more calls per day

Q4. Four lengths have a mode of 12 km and a range of 5 km. One of the lengths is 14 km. What are the other three lengths?

Ans:- One of the number is 14

Mode = 12 = NUmber wch occur max time

So, the other two number = 12 and 12

Range = highest - Lowest

5 = 14 - Lowest

Lowest = 14-5 = 9

so, the numbers are 9 , 12, 12 , 14

Q5. A group of students were timed as they completed a task.

12 14 16 15 10 12 15

Their times, in seconds, are listed above:

Work out:

a) The mode

Mode = Most occuring observation = 12 and 15

b) The median

Median = Middle number

Arrange in ascending order

10 12 12 14 15 15 16

Median = 14

c) The range

Highest - Lowest = 16 - 10 = 6

Q6. A science class took a test Here are their marks.

32 45 56 36 42 36 28

The teacher doubles the marks to change them into percentage

Work out:

64 90 112 72 84 72 56

a) mode = 72

b) Range = 112 - 56 = 56

c) MEdian = 56 64 72 72 84 90 112

Median = 72