Descriptive Sta...

Choose the correct answers from the alternatives given.
Directions for question 74 and 75: Study the following pie chart and answer the questions based on it.
The following pie-chart shows the result of an examination of 360 students.
The number of students who failed is

Let mean of $$100$$ data points be $$55$$ and variance be $$16$$ . Now if every data point is increased by $$2$$ units, then the sum of mean and standard deviation of new data point will be:

How many teachers are more than $$35$$ years old?

For $$X \rightarrow B (n, p), \,$$ if $$\, n = 25, E (x) = 10$$ , then S.D. $$(x) = $$

Find variance of the following data.

If $$\sum\limits_{i = 1}^9 {\left( {{x_i} - 5} \right) = 9}$$ and $$\sum\limits_{i = 1}^9 {{{\left( {{x_i} - 5} \right)}^2}}  = 45$$, then the standard deviation of the $$9$$ items $${x_1},{x_2},.....,{x_9}$$ is

Suppose a population $$A$$ has $$100$$ observations $$101,102,........,200$$ and another population $$B$$ has $$100$$ observations $$151,152......,250 $$. If $$V_{A}and V_{B}$$ represent the variences of the two populations respectively, then $$V_{A}/ V_{B}$$ is

If the sum of mean and variance of binomial distribution is 4.8 for 5 trials then

The mean deviation about the mean of the set of first $$n$$ natural numbers when $$n$$ is an odd number.

Find the standard deviation of 10 observation 111,211,311,....1011.