Practice the questions given in the worksheet on mean of ungrouped data.

**1.** Find the mean of the following.

(i) The first five positive integers.

(ii) The first six even natural numbers.

**2.** Find the mean of the following data.

(i) 7, 9, 3, 5, 8, 6

(ii) 4, 11, 0, 5, 10

**3.** Find the mean of the following data.

(i) 8, 9, 10, 11, 9, 8, 11, 10, 12, 11, 12, 12, 9, 9, 8, 11

(ii) 50, 55, 52, 54, 53, 55, 53, 50, 54, 54, 52, 53, 55, 55, 50, 55

**4.** The weights of 20 students of a class were as follows.

**Weight (in kg)**

40

42

45

46

48

**Total**

**Number of Students**

4

2

6

5

3

20

Find the mean weight.

**5.** The money spent by 30 students during the tiffin hours
were as follows.

**Money Spent (in $)**

0

5

10

20

25

30

**Total**

**Number of Students**

5

2

12

7

2

2

30

Find the mean expenditure.

**6.** Find a if the mean of

(i) 6, 16, a, 12, is 14

(ii) 12, 0, 10, 16, a is 11

**7.** The mean weight of 4 members of a family is 60 kg. Three
of them have the weights 56 kg, 68 kg and 72 kg. Find the weight of the fourth
member.

**8.** The mean daily wage earned by four labors is $ 180. If
another laborer James is included in the group the mean daily wage goes up to $
185. Find the daily wage of James.

**9.** The mean of three numbers is 8. The mean of those three
numbers and x is 7. Find x.

**Answers**

**1.** (i) 3

(ii) 7

**2.** (i) 6\(\frac{1}{3}\)

(ii) 6

**3.** (i) 10

(ii) 53

**4.** 44.4

**5.** 12\(\frac{2}{3}\)

**6.** (i) 22

(ii) 17

**7.** 44 kg

**8.** $ 205

**9.** 4

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