Showing Mcqs of math -- (543)

 The average of first five prime numbers is:

4.5

5

5.6

7.5

The average of first 50 natural numbers is:

12.25

21.25

25

25.5

The average of 7 consecutive numbers is 33. The largest of these numbers is:

36

33

30

28

The average height of 30 boys out of a class of 50, is 160 cm. If the average height of the remaining boys is 165 cm, the average height of the whole class (in cm) is:

161

162

163

164

The average of eight numbers is 14. The average of six of these numbers is 16. The average of the remaining two numbers is:

4

8

16

32

The mean of 100 observations was calculated as 40. It was found later on that one of the observations was misread as 83 instead of 53. The correct mean is:

39

39.7

40.3

42.7

 A motorist travels to a place 150 km away at an average speed of 50 km per hour and returns at 30 km per hour. His average speed for the whole journey in km per hour is:

35

37

37.5

35.5

A cricketer has a certain average for 9 innings. In the tenth inning, he scores 100 runs, thereby increasing his average by 8 runs. His new average is: 

20 runs

24 runs

28 runs

32 runs

 Five years ago, the average age of P and O was 15 years. Average age of P, Q and R today is 20 years. How old will R be after 10 years?

60yrs

50yrs

40yrs

30yrs

 In a class of 20 students in an examination in Mathematics) students scored 100 marks each. 3 got zero each and the averag of the rest was 40. What is the average of the whole class?

40 marks

60 marks

none

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