Probability: Mixed Practice, Quiz (Class 10)

A box has

20

bulbs, of which

4

are faulty. One is taken at random. What is the probability it is good?

A

\displaystyle \dfrac{1}{4}

B

\displaystyle \dfrac{4}{5}

C

\displaystyle \dfrac{1}{5}

D

\displaystyle \dfrac{4}{20}

A bag has

6

red balls and some blue balls. The probability of drawing red is

\displaystyle \dfrac{1}{4}

. How many blue balls are there?

A

18

B

12

C

24

D

2

A number is chosen at random from

1

to

30

. What is the probability it is a multiple of

4

?

A

\displaystyle \dfrac{8}{30}

B

\displaystyle \dfrac{2}{15}

C

\displaystyle \dfrac{7}{30}

D

\displaystyle \dfrac{1}{4}

Two dice are rolled. What is the probability that both show odd numbers?

A

\displaystyle \dfrac{1}{6}

B

\displaystyle \dfrac{1}{2}

C

\displaystyle \dfrac{1}{4}

D

\displaystyle \dfrac{1}{3}

If

P(E) = 0.08

, what is

P(\text{not } E)

?

A

0.2

B

0.92

C

0.08

D

1.08

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