Statistics Test...

Mean of $$50$$ observations was found to be $$80.4$$. But later on, it was discovered that $$96$$ was misread as$$ 69$$ at one place. Find the correct mean.

If the mode of the following data $$10, 11, 12, 10, 15, 14, 15, 13, 12, x, 9, 7$$ is $$15$$, then the value of $$x$$ is:

The mode of 9, 8, 7, 7, 6, 3, 7, 2, 1, 7, 9 is

The distribution below gives the weights of $$30$$ students of a class. Find the median weight of the students

Weight (in kg)	40-45	45-50	50-55	55-60
No. of students	2	3	8	6
Weight (in Kg)	60-65	65-70	70-75
No. of students	6	3	2

Formula for grouped data of median is

Find mode when median is $$125.6$$ and mean is $$128$$.

If the values of mode and mean are $$60$$ and $$66$$ respectively, then the value of median is

The height of $$30$$ boys of a class are given in the following table :

Height in cm	Frequency
120 - 129 130 - 139 140 - 149 150 - 159 150 - 159	2 8 10 7 3

If by joining a boy of height $$140$$ cm, the median of the heights is changed from $$M_1$$ to $$M_2$$, then $$M_1 - M_2$$, in cm is

Formula for calculating median of the grouped data is 

If for a moderately skewed distribution, Mode $$= 60$$ and Mean $$=66$$, then median $$=$$