Dr. Lal and Jain Solutions for Exercise 1: Exercise 16

If mean of $7, 3, a$and $8$ is $6$, what is the value of $a$?

What is the mean deviation from the mean of $7,14, 22$ and $25$?

The mean of five numbers is $21$. If the sixth number $33$ is included, what will be the mean of six numbers?

(A) $21$

(B) $22$

(C) $34$

(D) $23$

If the mean and median of all the terms of a table is $5$ and $6$ respectively. What is the mode of the series?

Standard deviation of $1, 4, 5, 7$ and $8$ is $2.45$. If $10$ is added to each term, what is the new standard deviation?

In a class of $43$students, the height of $20$students is less than $150\mathrm{cm}$ and the height of $16$students is more than $160\mathrm{cm}$. The height [in cm] of the remaining seven students is as follows: $152, 154, 155, 155, 155, 158, 158$. Determine the median height of the students.

If mean and standard deviation of distribution be $10$and $8$respectively, what will be the coefficient of variation of that distribution?

What will be the standard deviation of the set of numbers $1, 4, 7,...... 16, 19$