Statistics Quiz 1

In the formula $\bar x= a + \frac{\sum f_id_i}{\sum f_i}$ for finding the mean of grouped data $d_i's$ are the deviations from a of

While computing mean of grouped data,we assume that the frequencies are

In the formula $\bar x= a +h \frac{\sum f_iu_i}{\sum f_i}$, for finding the mean of grouped frequency distribution, $u_i$ =

The abscissa of the point of intersection of the less than type and of the more than type cumulative frequency curves of a grouped data gives its

For the following distribution :

the model class is  

The times,in seconds,taken by 150 athletes to run a 110 m hurdle race is tabulated below :

The number of athletes who completed the race in less than 14.6 seconds is

Consider the following distribution :

The frequency of the class 30-40 is

Assertion (A) : If the median and mode of a frequency distribution are 150 and 154 respectively. Then its mean is 148.

Reason (R) : Mean,median and mode of a frequency distribution are related as 2 Mean = 3 Median - Mode.

Assertion (A) : The mean of terms x,y and z is y, then x + z = 3y.

Reason (R) : Mean = $\frac{sum\,of\,observations}{Number\,of\,observations}$.

Assertion (A) : If the number of runs scored by 11 players of a cricket team of India are 5,19,42,11,50,30,0,52,36,27,21 then median is 30.

Reason (R) : Median = $(\frac{n+1}{2})^{th}$ value, when n is odd.

Which of the following is a measure of central tendency?

If the difference of mode and median of a data is 24, then the difference of median and mean is

If $\bar x$ is the mean of $x_i's$, then the value of $\displaystyle\sum_{i=1}^{n} x_i$ is

The mean, mode and median of grouped data will always be

The mean and median of a distribution are 14 and 15 respectively. The value of mode is