Question

a jar contains white, red, green and blue marbles. the probability of pulling a red marble is 0.2. what is the probability of not pulling a red marble?

Explanation:

Step1: Use the probability formula

The probability of an event \(A\) not occurring, denoted as \(P(\text{not }A)\), is given by \(P(\text{not }A)=1 - P(A)\). Here, \(A\) is pulling a red marble and \(P(A) = 0.2\).

Step2: Calculate the probability

Substitute \(P(A)=0.2\) into the formula: \(P(\text{not red})=1 - 0.2=0.8\). Convert \(0.8\) to a percentage: \(0.8\times100\% = 80\%\).

Answer:

\(80\%\)