10th, statistics and probability

In the formula  $\overline{x}=a+\frac{f_iu_i}{f_i}\times h$  , for finding the mean of grouped frequency distribution,  $u_i=$  

•  $\frac{x_i+a}{h}$  

•  $h\left(x_i-a\right)$  

•  $\frac{x_i-a}{h}$  

•  $\frac{a-x_i}{h}$  

Consider the following frequency distribution :

The upper limit of the median class is

• 17

• 17.5

• 18

• 18.5

For the following distribution :

the modal class is

• 10-20

• 20-30

• 30-40

• 50-60

An event is very unlikely to happen. Its probability is closest to

• 0.0001

• 0.001

• 0.01

• 0.1

A card is selected from a deck of 52 cards. The probability of its being a red face card is

• $\frac{3}{26}$

• $\frac{3}{13}$

• $\frac{2}{13}$

• $\frac{1}{2}$

When a die is thrown, the probability of getting an odd number less than 3 is

• $\frac{1}{6}$

• $\frac{1}{3}$

• $\frac{1}{2}$

• $0$

A girl calculates that the probability of her winning the first prize in a lottery is 0.08. If 6000 tickets are sold, how many tickets has she bought?

• 40

• 240

• 480

• 750

One ticket is drawn at random from a bag containing tickets numbered 1 to 40. The probability that the selected ticket has a number which is a multiple of 5 is

• $\frac{1}{5}$

• $\frac{3}{5}$

• $\frac{4}{5}$

• $\frac{1}{3}$

Which of the the following can be the probability of an event?

• – 0.04

• 1.004

• $\frac{18}{23}$

• $\frac{8}{7}$

Consider the following frequency distribution of the heights of 60 students of a class :

• 310

• 315

• 320

• 330