Statistics Test...

If the SD of a set of observation is $$8$$ and each observation is divided by $$-2$$, then the SD of the new set of observations will be.

Range and standard deviation are similar in that each looks

The mean deviation of the numbers $$3,4,5,6,7$$ from mean is

Mean of $$9$$ observations was founded to be $$35$$. Later on, it was detected that an observation $$81$$ was misread as $$18$$, then the correct mean of the observations is ____________.

Mean deviation of $$6, 8, 12, 15, 10, 9$$ through mean is:

The sum of the deviations of the variates  from the arithmetic mean is always.

If the median of the data $$6,7,x-2,x,18,21$$ written in ascending order is $$16$$, then the variance of the data is

The mean salary paid per week to $$1000$$ employees of an establishment was found to be Rs. $$900$$. Later on, it was discovered that the salaries of two employees were wrongly recorded as Rs. $$750$$ and Rs. $$365$$ instead of Rs. $$570$$ and Rs. $$635$$. Find the corrected mean salary.

Find the arithmetic mean of numbers from $$1$$ to $$9$$.