A box contains 97
red marbles, 53
white marbles, and 16
blue marbles.
If a marble is randomly selected from the box, what is the probability that it is not red? Express your answer as a simplified fraction or a decimal rounded to four decimal places.
The total number of marbles in the box is 97 + 53 + 16 = 166.
The probability of selecting a marble that is not red is the number of non-red marbles divided by the total number of marbles. This is equal to (53 + 16) / 166 = 69 / 166.
Therefore, the probability that a randomly selected marble is not red is 69/166, which is approximately 0.4157 when rounded to four decimal places.