Question

A jar contains 5 blue marbles, 8 red marbles, 4 white marbles, and 3 purple marbles. Suppose you pick a marble at random without looking . What is the experimental probability of not picking a white marble?

Answer 1

A jar contains 5 blue marbles, 8 red marbles, 4 white marbles, and 3 purple marbles.

Number of blue marbles = 5

Number of red marbles = 8

Number of white marbles = 4

Number of purple marbles = 3

Total number of marbles = 5 + 8 + 4 + 3

Total number of marbles =20

The probability formula is defined as the possibility of an event to happen is equal to the ratio of the number of favourable outcomes and the total number of outcomes

`\text{ Probability = }\frac{Number\text{ of favourable Outcomes}}{Number\text{ of Possible Outcomes}}`

Probability of picking white marbles + Probability of not picking marbles = 1

Probability of not picking white marbles = 1 - Probability of picking marbles

`\begin{gathered} \text{ Probability of picking white marbles = }\frac{Number\text{ of white marbles}}{Total\text{ number of white marbles}} \\ \text{ Probability of picking white marbles =}(4)/(20) \\ \text{ Probability of picking white marbles =}(1)/(5) \\ \text{ Probability of picking white marbles =}0.2 \end{gathered}`

As :

Probability of not picking white marbles = 1 - Probability of picking marbles

Probability of not picking white marbles = 1 - 0.2

Probability of not picking white marbles = 0.8

Answer : Probability of not picking white marbles = 0.8

Answer 2

4/5

Explanation:

5 blue marbles, 8 red marbles, 4 white marbles, and 3 purple marbles = 20 marbles

not white marbles = 5 blue marbles, 8 red marble and 3 purple marbles = 16 marbles

experimental probability

P ( not white) = note white ) / total = 16/20 = 4/5