71.

The average of 9 observations was found to be 35. Later on, it was detected that on observations 81 was misread as 18. The correct average of the observations is:

• 28

• 42

• 32

• 32

The average temperature of Monday, Tuesday, Wednesday, Thursday and Friday is 63°. If the ratio of temperature for Monday and Friday is 21 : 25, then what is the temperature of Friday?

• 70°

• 73°

• 75°

• 75°

The average of marks obtained by 100 candidates in a certain examination is 30. If the average marks of passed candidates is 35 and that of failed candidates is 10, what is the number of candidates who passed the examination?

• 60

• 70

• 80

• 80

The average weight of 10 parcels is 1.7 kg. Addition of another new parcel reduces the average weight by 60 gm. What is the weight, in kg, of the new parcel?

• 1.04

• 1.08

• 1.4

• 1.4

A student, by mistake, wrote 64 in place of 46 as a number at the time of finding the average of 10 given and got the average as 50. The correct average of the number is:

• 48.2

• 48

• 48.1

• 48.1

The average marks obtained by a class of 60 students is 65. The average marks of half of the students is found to be 85. The average marks of the remaining students is:

• 35

• 45

• 55

• 65

The average marks obtained in a class of 50 students is 70%. The average of first 25 is 60% and that of 24 is 80%. What is the marks obtained by the last student?

• 90%

• 60%

• 80%

• 70%

Visitors to a show were charged â‚¹ 15 each on the first day, â‚¹ 7.50 on the second day, â‚¹ 2.50 on the third day and total attendance on three days were in the ratio 2 : 5 : 13  respectively. The average charge per person for the entire three day is

• ₹ 5

• ₹ 5.50

• ₹ 6

• ₹ 7

The average salary of male employees in a firm was â‚¹ 5,200/- and that of females was â‚¹ 4,200/-. The mean salary of all the employees was â‚¹ 5,000/-. What is the percentage of female employees?

• 80%

• 20%

• 40%

• 30%

If the Arithmetic mean of 7, 5, 13, x and 9 is 10, then the value of x is

• 10

• 12

• 14

• 16