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For a distribution, if $\sum f = 20$ and $\sum fx = 100$, what is the mean?
If the median of 5 numbers is 10, and each number is increased by 2, the new median is:
Which class is the modal class for the frequencies: 0-10 (5), 10-20 (12), 20-30 (8)?
If the sum of 10 observations is 150 and the mean of 5 of them is 10, what is the mean of the remaining 5?
In the formula for median of grouped data $L + \frac{\frac{N}{2} - cf}{f} \times h$, what does 'cf' represent?
The mean of five numbers is 27. If one number is excluded, the mean becomes 25. The excluded number is:
Find the mode from the following: Class 0-5 (freq 2), 5-10 (freq 5), 10-15 (freq 2).
If the mean of 1, 2, 3... n is 6, what is n?
The mean of a set of data is 5. If every value is doubled and then 3 is added, the new mean is:
A student scored 70, 80, and 90 in three tests. What score does he need in the fourth test to have a mean of 85?
In a distribution, if Mean < Median < Mode, the distribution is:
If the mean of 10 observations is 20 and another 10 observations is 30, the combined mean is:
Find the mode of 1, 2, 2, 3, 3, 3, 4, 4, 4, 4.
If the mean of x-5, x-3, x, x+3, x+5 is 15, find x.
If the sum of squares of deviations of 10 observations from their mean is 0, then:
If the mean of $x_1, x_2, ... x_n$ is $\bar{x}$, what is the mean of $ax_1+b, ax_2+b, ... ax_n+b$?
In a grouped frequency distribution, if the median class is 20-30, L=20, N=40, cf=15, f=10, h=10, the median is: