200+ Probability-and-statistics Questions

Probability-and-statistics Questions Set 20:

Quiz Mode

Average of 40 numbers is 71. If the number 100 replaced by 140, then average is increased by _____

Solution:

The average of 5 terms is 50. If the first 4 terms are 44, 52, 96, and 64, what will be the last term?

-5

-6

Solution:

Average age of three boys is 22 years. If the ratio of their ages is 6 : 9 : 7, then the age of the youngest boy is ______

20 years

16 years

15 years

18 years

Solution:

The average of 25 observations is 50. If the average of the first 13 observations is 40 and that of the last 13 observations is 58, then what is the 13th observation?

Solution:

The average weight of P and his three friends is 55 kg. If P is 4 kg more than the average weight of his three friends, what is P's weight (in kg)?

68 kg

58 kg

70 kg

65 kg

Solution:

The average of nine numbers is 60, that of the first five numbers is 55 and the next three is 65. The ninth number is 12 less than the tenth number. Then, tenth number is ______

Can't Decide

Solution:

If μ and σ are the mean and standard deviation of a set of observations. If each observation is increased by 7, let the new mean and standard deviation be μ1 and σ1, then the correct option is ______

μ < μ1 and σ = σ1

μ > μ1 and σ = σ1

μ = μ1 and σ = σ1

μ = μ1 and σ < σ1

Solution:

The average salary of the entire staff in Tata Company is Rs.15000 per month. The average salary of officers is Rs.45000 per month and that of non-officers is Rs.10000 per month. If the number of officers is 20 then find the number of non-officers in the Reliance company.

Solution:

The average age of three persons P, Q and R is 24 years. S joins the group the average age becomes 30 years. If another person T who is 4 years older than S joins the group, then the average age of five persons is years and the age of S is years.

38, 50

40, 52

34.4, 48

36, 45

Solution:

The average spending of a family per week during a four-week period on essentials items was ₹1,475. During the first three weeks the family spent ₹1,200, ₹1,500 and ₹1,875 on such items. How much did the family spend on these items in the final week to ensure that the weekly average is maintained?

Rs 1275

Rs 1325

Rs 1375

Rs 1225

Probability-and-statistics Questions Set 20:

Average of 40 numbers is 71. If the number 100 replaced by 140, then average is increased by _____

Solution:

The average of 5 terms is 50. If the first 4 terms are 44, 52, 96, and 64, what will be the last term?

Solution:

Average age of three boys is 22 years. If the ratio of their ages is 6 : 9 : 7, then the age of the youngest boy is ______

Solution:

The average of 25 observations is 50. If the average of the first 13 observations is 40 and that of the last 13 observations is 58, then what is the 13th observation?

Solution:

The average weight of P and his three friends is 55 kg. If P is 4 kg more than the average weight of his three friends, what is P's weight (in kg)?

Solution:

The average of nine numbers is 60, that of the first five numbers is 55 and the next three is 65. The ninth number is 12 less than the tenth number. Then, tenth number is ______

Solution:

If μ and σ are the mean and standard deviation of a set of observations. If each observation is increased by 7, let the new mean and standard deviation be μ1 and σ1, then the correct option is ______

Solution:

The average salary of the entire staff in Tata Company is Rs.15000 per month. The average salary of officers is Rs.45000 per month and that of non-officers is Rs.10000 per month. If the number of officers is 20 then find the number of non-officers in the Reliance company.

Solution:

The average age of three persons P, Q and R is 24 years. S joins the group the average age becomes 30 years. If another person T who is 4 years older than S joins the group, then the average age of five persons is years and the age of S is years.

Solution:

Solution:

Related Question Sets:

Related Topics:

Probability-and-statistics Questions Set 20:

Average of 40 numbers is 71. If the number 100 replaced by 140, then average is increased by _____

Solution:

The average of 5 terms is 50. If the first 4 terms are 44, 52, 96, and 64, what will be the last term?

Solution:

Average age of three boys is 22 years. If the ratio of their ages is 6 : 9 : 7, then the age of the youngest boy is ______

Solution:

The average of 25 observations is 50. If the average of the first 13 observations is 40 and that of the last 13 observations is 58, then what is the 13th observation?

Solution:

The average weight of P and his three friends is 55 kg. If P is 4 kg more than the average weight of his three friends, what is P's weight (in kg)?

Solution:

The average of nine numbers is 60, that of the first five numbers is 55 and the next three is 65. The ninth number is 12 less than the tenth number. Then, tenth number is ______

Solution:

If μ and σ are the mean and standard deviation of a set of observations. If each observation is increased by 7, let the new mean and standard deviation be μ1 and σ1, then the correct option is ______

Solution:

The average salary of the entire staff in Tata Company is Rs.15000 per month. The average salary of officers is Rs.45000 per month and that of non-officers is Rs.10000 per month. If the number of officers is 20 then find the number of non-officers in the Reliance company.

Solution:

The average age of three persons P, Q and R is 24 years. S joins the group the average age becomes 30 years. If another person T who is 4 years older than S joins the group, then the average age of five persons is ____ years and the age of S is ____ years.

Solution:

Solution:

Related Question Sets:

Related Topics:

The average age of three persons P, Q and R is 24 years. S joins the group the average age becomes 30 years. If another person T who is 4 years older than S joins the group, then the average age of five persons is years and the age of S is years.