Tamil Nadu Board Solutions for Chapter: Statistics And Probability, Exercise 15: Exercise 8.5

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

Which of the following is incorrect?

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

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,

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

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

If a letter is chosen at random from the English alphabets $\left\{a, b,...,z\right\}$, then the probability that the letter chosen precedes $x$

A purse contains $10$ notes of$₹2000, 15$ notes of $₹500$, and $25$ notes of $₹200$. One note is drawn at random. What is the probability that the note is either a $₹500$ note or $₹200$ note?