Probability

Orn has the same type and size of dolls. They are 4 pink dolls and 1 green doll. If Orn randomly picks up 1 doll find the probability to get green.

• 0

• $\frac{1}{5}$

• $\frac{2}{5}$

• 1

Tossing 2 dices at the same time for 1 time, which one is the event that the addition results of points on both dices to be 6?

• (1, 5), (2, 4), (3, 3)

• (0, 6), (1, 5), (2, 4), (3, 3)

• (1, 5), (2, 4), (3, 3), (4, 2), (5, 1)

• (0, 6), (1, 5), (2, 4), (3, 3), (4, 2), (5, 1), (6, 0)

To pick up 2 alphabet cards of B, O, Y cards one by one and return them back before picking up the second time, what is the possibility to get the same alphabet cards?

• $\frac{1}{9}$

• $\frac{1}{6}$

• $\frac{1}{3}$

• $\frac{1}{2}$

A jar has 4 red table tennis balls, 3 green table tennis balls and 5 blue table tennis. If we mixed them up and randomly pick up one of them, find the probability to get green

• $\frac{1}{4}$

• $\frac{1}{16}$

• $\frac{1}{8}$

• $\frac{2}{5}$

In a company, there are 45 salesmen and 55 saleswomen. If we pick one name of those salespeople to manage products to sell in each day, what is the probability to get salesmen?

• $\frac{9}{11}$

• $\frac{9}{20}$

• $\frac{1}{10}$

• $\frac{1}{20}$

Keng pick up a candy from his bag which has 10 candies. It is a ……..

• Random sampling

• Not a random sampling

• Statistics

• I don't know

Tossing a one-baht coin on the ground, all occurring events are 2 cases (head and tail sides). Is this true or false?

• True

• False

• I'm not sure

• None of these

John has `2 yellow socks and 2 black socks. If he picks 2 socks at the same time without looking, what is the chance to get 2 black socks?

• $\frac{1}{8}$

• $\frac{1}{4}$

• $\frac{3}{4}$

• $\frac{1}{2}$

There are 10 marbles in a bowl: 7 white marbles and 3 black marbles. Random sampling to pick up 1 marble, what is the number of possible occurring events of white marbles to be picked up?

• $\frac{9}{10}$

• $\frac{7}{10}$

• $\frac{3}{10}$

• $\frac{1}{10}$

Tossing 2 dices at the same time for 1 time. Please find the probability to get the sum of both dices to be 11

• $\frac{1}{36}$

• $\frac{1}{18}$

• $\frac{3}{10}$

• $\frac{1}{10}$