Advertisements
Advertisements
Question
The mean of first fifteen even numbers is ____________
Options
4
16
5
10
Advertisements
Solution
16
Explanation;
Hint:
`(2 + 4 + 6 + .... + 30)/15 = (2[1 + 2 + 3 + .... 15])/15`
= `2 xx 120/15`
= 16
APPEARS IN
RELATED QUESTIONS
The mean is one of the numbers in a data.
The number of Science and Mathematics projects submitted by Model high school, Nandpur in last 20 years at the state level science exibition is:
2, 3, 4, 1, 2, 3, 1, 5, 4, 2, 3, 1, 3, 5, 4, 3, 2, 2, 3, 2. Prepare a frequency table and find the mean of the data.
The mean of a set of seven numbers is 81. If one of the numbers is discarded, the mean of the remaining numbers is 78. The value of discarded number is
If the mean of five observations x, x + 2, x + 4, x + 6, x + 8, is 11, then the mean of first three observations is
Let x, y, z be three observations. The mean of these observations is ______.
Mean can never be a fraction.
Find the mean of the first ten even natural numbers.
The marks in a subject for 12 students are as follows:
31, 37, 35, 38, 42, 23, 17, 18, 35, 25, 35, 29
For the given data, find the mean
The mean age of 25 teachers in a school is 40 years. A teacher retires at the age of 60 years and a new teacher is appointed in his place. If the mean age of the teachers in this school now is 39 years, then the age (in years) of the newly appointed teacher is ______.
In a class of 100 students there are 70 boys whose average marks in a subject are 75. If the average marks of the complete class is 72, then what is the average of the girls?
