Change in Mean Values

Q.

The average marks of 10 students is 60. If the highest mark is excluded, the average is 59. Find the highest mark

Q. The average marks of 18 students was calculated to be 65.
However, it was later found out that the marks of one student had been wrongly entered as 24 instead of 34 and 88 instead of 78 . Find the correct mean.

Q. The mean of 4, 9, 10 and x is 8.find x

Q.

The tallest player in a basketball team is 75 inches tall and the shortest player is 61 inches tall. Which conclusion about the heights of the team players is supported by this data?

1. The median is 68

2. The range is 14

3. The mean is 68

4. The mode is 75

Q. If all the observations of a given dataset is decreased by 5 , mean of the dataset will

1. increase by 5
2. will remain same
3. decrease by 5
4. be multiplied by 5

Q.

Angelina obtained the following scores (out of 50) in six mathematics tests. What is her mean score?

33.5, 40.5, 25.5, 45.5, 48, 32

Q.

Seem a obtained three following scores (out of 100) on a spelling test: 80 85 90 71 60 100.What is her mean score?

Q.

An average gives us an idea of the largest value in a group of numbers

1. True
2. False

Q.

HOW TO FIND THE MEAN OF THE FIRST 5 WHOLE NUMBERS

Q. If all the observations of a given dataset is multiplied by 6 , mean of the dataset will

1. will remain same
2. decrease by 6
3. increase by 6
4. be multiplied by 6

Q. Random numbers in a data set are given as 15 , 25 , 35 , 35 and 40 . All the numbers are divided by 5 , then multiplied by 2 followed by addition of 3. What will be the mean of new data set ?

1. 30
2. 12
3. 6
4. 15

Q. The average of x numbers is y. Out of these numbers one number is 10. What will be the average of the remaining numbers, if 10 is omitted from the group of numbers?
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Q. Find the mean of first six multiples of 5.

Q. Anita is 42 years old and her niece is 14 years old presently. Estimate the ratio of Anita's age to her niece's age after 10 years.

1. 12:13
2. 6:13
3. 13:6
4. 6:5

Q.

The enrolment in a school during six consecutive years was as follow:

1555, 1670, 1750, 2013, 2540, 2820

Find the mean enrolment of the school for this period.

Q. What is the formula of mean?

Q. Find the mean of 994, 996, 998, 1002 and 1000.

Q. Ages of members in a family are given as 10 , 20 , 30 , 35 and 40.
What will be mean of their ages after 5 years?

1. 27
2. 30
3. 32
4. 37

Q. Find the mean of first six multiples of 5.

Q.

What do we mean by mean in data handling?

Q.

In a certain hospital, the mean birth rate of a week was 35. If the mean birth rate fom monday to thursday was 32 and that to of thursday to sunday was 36, find the number of births on thursday.

Answer ASAP