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You flip a coin. $\newline$ What is $P(\text{tails or heads})$ ? $\newline$ Choices: $\newline$ (A) $50\%$ $\newline$ (B) $80\%$ $\newline$ (C) $90\%$ $\newline$ (D) $100\%$

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Probability of mutually exclusive events and overlapping events

Full solution

Q. You flip a coin.

\newline

What is

P(\text{tails or heads})

?

\newline

Choices:

\newline

(A)

50\%

\newline

(B)

80\%

\newline

(C)

90\%

\newline

(D)

100\%

Understand the problem: Step $1$ : Understand the problem. We need to find the probability of getting either heads or tails when flipping a coin.
Calculate the probability: Step $2$ : Calculate the probability. Since a coin has two sides, heads and tails, and each side has an equal chance of landing up, the probability of getting either heads or tails in one flip is $1$ (since heads or tails are the only outcomes).
Convert to percentage: Step $3$ : Convert the probability to a percentage. Probability of $1$ equals $100$ \%, so $P(\text{tails or heads}) = 100$ \%.

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