Question

you flip a coin. what is p(not tails)? write your answer as a percentage rounded to the nearest tenth.

Explanation:

Step1: Identify total and favorable outcomes

A coin - flip has 2 possible outcomes (heads or tails). 'Not tails' means heads, so there is 1 favorable outcome out of 2 total outcomes.
The probability formula is $P(A)=\frac{\text{Number of favorable outcomes}}{\text{Total number of outcomes}}$. So $P(\text{not tails})=\frac{1}{2}$.

Step2: Convert to percentage

To convert a fraction to a percentage, we use the formula $\text{Percentage}=P\times100\%$.
So $\text{Percentage}=\frac{1}{2}\times100\% = 50.0\%$.

Answer:

50.0%