The average of 3 different numbers is 17. If two of the numbers are 8 and 12, what is the third number?
31
35
38
28
The average age of a group of 7 athletes is 22 years. An athlete whose age is 36 years joins the group. Will the average age of the group increase or decrease and by how much?
It will increase by 1.75 years.
It will decrease by 1.75 years.
It will increase by 2.75 years.
It will decrease by 2.75 years.
The number 50, 42, 41, 35, 2x + 10, 2x – 8, 12, 11, 8, 6 are arranged in descending order. If their median is 25, what is the value of x?
12
14
17
13
The marks scored by 11 students in a test are 34, 37, 30, 38, 50, 34, 34, 38, 36, 45 and 31. What is the mode of the data?
34 marks
36 marks
42 marks
30 marks
The rainfall in a city over 3 days of a certain week are 3.5 mm, 8.3 mm and 8.9 mm. What is the mean rainfall for these three days?
6.9 mm
10.8 mm
10.2 mm
6.7 mm
What is the value of x if the mean of the given data is 20?
22, 17, x, 19, 25, 23, 16
18
16
20
15
The marks scored by 11 students in a test are 24, 34, 37, 38, 45, 34, 34, 38, 36, 45 and 31. What is the range of the given data?
21
25
27
23
Typing
The weights (in kg) of 7 students of a class are 30, 32, 28, 25, 42, 36 and 31. Type their mean weight (in kg).
The mean of six numbers is 15. If five of them are 9, 12, 13, 18 and 21, type the sixth number.
Type the mean of the first eight odd natural numbers.
The heights of 6 students (in cm) are 154, 152, 156, 154, 158 and 151. Type their median height.
The marks scored by 7 students in a test are 37, 15, 40, 30, 58, 25 and 40. Type the range of the data.
The mean weight of 6 boys in a group is 48 kg. If five boys of the group weigh 51 kg, 45 kg, 49 kg, 46 kg and 44 kg, type the weight of the sixth boy.
