you flip a coin. what is p(not tails)? write your answer as a fraction or whole number.

Explanation:

Step1: Determine total outcomes

A coin - flip has 2 possible outcomes (heads or tails), so $n(S)=2$.

Step2: Determine favorable outcomes

The event of "not tails" is the event of getting heads. So $n(A) = 1$.

Step3: Calculate probability

The probability formula is $P(A)=\frac{n(A)}{n(S)}$. Substituting the values, we get $P(\text{not tails})=\frac{1}{2}$.

Answer:

$\frac{1}{2}$