Descriptive Sta...

If the mean deviation about the median of the numbers $$a,2a,....,50a$$ is $$50$$, then $$|a|$$ equals:-

For a random variable $$X$$. If $$E(X)=5$$ and $$V(X)=6$$, then $$E(X^{2})$$ is equal to 

The variance of first $$50$$ even natural numbers is:-

If $$\displaystyle\sum _{ i=1 }^{ 18 }{ \left( { x }_{ i }-8 \right)  } =153,\displaystyle\sum _{ i=1 }^{ 18 }{ \left( { x }_{ i }-8 \right) ^{ 2 } } =45$$ then standard deviation of $$x_{1},x_{2},........,x_{n}$$ is 

Standard deviation of four observations $$-1, 0, 1$$ and k is $$\sqrt{5}$$ then k will be?

If expected value in n Bernoulli trials is $$8$$ and variance is $$4$$. If $$P(x\leq 2)=\dfrac{k}{2^{16}}$$ then value of k is?

The mean of $$5$$ observation is $$4.4$$ and variance is $$8.24$$. If three of the five observations are $$1,2$$ and $$6$$, then what are the other two observations ? 

The standard deviation of the data $$6,5,9, 13, 12, 8, 10$$ is 

Observe the following pictograph which shows the number of ice cream cones sold by school canteen during a week. Chose the correct answer from the given options:
Ratio of the number of ice cream cones sold on Saturday to the number of ice cream cones sold on Wednesday is.

Observe the following pictograph which shows the number of ice cream cones sold by school canteen during a week. Chose the correct answer from the given options:
Total number of ice cream cones sold during the whole week was: