Variance of first $20$ natural numbers is

Important Questions on Statistics And Probability

EASY

10th Tamil Nadu Board

IMPORTANT

Mathematics Standard 10>Chapter 8 - Statistics And Probability>Exercise 8.5>Q 6

The standard deviation of a data is $3$. If each value is multiplied by $5$, then the new variance is

EASY

10th Tamil Nadu Board

IMPORTANT

Mathematics Standard 10>Chapter 8 - Statistics And Probability>Exercise 8.5>Q 7

If the standard deviation of $x, y, z$ is $p$, then the standard deviation of $3x+5, 3y+5, 3z+5$, is

EASY

10th Tamil Nadu Board

IMPORTANT

Mathematics Standard 10>Chapter 8 - Statistics And Probability>Exercise 8.5>Q 8

If the mean and coefficient of variation of a data are $4$ and $87.5\%$, then the standard deviation is

EASY

10th Tamil Nadu Board

IMPORTANT

Mathematics Standard 10>Chapter 8 - Statistics And Probability>Exercise 8.5>Q 9

Which of the following is incorrect?

EASY

10th Tamil Nadu Board

IMPORTANT

Mathematics Standard 10>Chapter 8 - Statistics And Probability>Exercise 8.5>Q 10

The probability of a red marble selected at random from a jar containing $\mathrm{p}$ red, $\mathrm{q}$ blue and $\mathrm{r}$ green marbles is

MEDIUM

10th Tamil Nadu Board

IMPORTANT

Mathematics Standard 10>Chapter 8 - Statistics And Probability>Exercise 8.5>Q 11

A page is selected at random from a book. The probability that the digit at units place of the page number chosen is less than $7$ is,

EASY

10th Tamil Nadu Board

IMPORTANT

Mathematics Standard 10>Chapter 8 - Statistics And Probability>Exercise 8.5>Q 12

The probability of getting a job for a person is $\frac{x}{3}$. If the probability of not getting the job is $\frac{2}{3}$, then the value of $x$ is

EASY

10th Tamil Nadu Board

IMPORTANT

Mathematics Standard 10>Chapter 8 - Statistics And Probability>Exercise 8.5>Q 13

Kamalam went to play a lucky draw contest. $135$ tickets of the lucky draw were sold. If the probability of Kamalam winning is $\frac{1}{9}$, then the number of tickets bought by Kamalam is