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India
Class IX

Complementary Events

Interactive practice questions

Determine which of the following pairs of events are complementary.

a

Event A: Selecting a positive number.

Event B: Selecting a negative number.

Complementary

A

Not complementary

B
b

Event A: Drawing a red card from a standard deck of cards (no jokers).

Event B: Drawing a black card from a standard deck of cards (no jokers).

Complementary

A

Not complementary

B
c

Event A: Drawing a club from a standard deck of cards (no jokers).

Event B: Drawing a spade from a standard deck of cards (no jokers).

Complementary

A

Not complementary

B
d

Event A: Rolling a number greater than $3$3 on a die.

Event B: Rolling a number less than $3$3 on a die.

Complementary

A

Not complementary

B
Easy
1min

The probability that a certain event will occur is $\frac{2}{9}$29.

Determine the probability that the complementary event will occur.

Easy
< 1min

The probability of an event is $0.64$0.64. What is the probability of the complementary event?

Easy
< 1min

A biased coin is flipped, with heads and tails as possible outcomes. Calculate $P\left(\text{heads}\right)$P(heads) if $P\left(\text{tails}\right)$P(tails) is $0.64$0.64.

Easy
< 1min
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Outcomes

9.SP.P.1

Repeated experiments and observed frequency approach to probability. Focus is on empirical probability.

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