What is the probability of getting an even number when rolling a six-sided number cube?
A. 0.5
B. 5%
C. StartFraction 2 over 6 EndFraction
D. 30%
C. StartFraction 2 over 6 EndFraction
You place the letters for the word smart in a bag. What is the probability of choosing a letter that is not a vowel? (Remember, vowels are A, E, I, O, and U.)
A. 0.2
B. StartFraction 1 over 5 EndFraction
C. 80%
D. 0.75
A. 0.2.
The word SMART has 5 letters. Out of those, only the letter 'A' is a vowel. Therefore, there are 4 letters that are not vowels. The probability of choosing one of these letters is 4/5 or 0.8.
You have a bag with 20 marbles: 2 yellow, 5 green, 12 red, and 1 blue. Which of the following statements are true? Select all that apply.
A. The probability of choosing a yellow, green, red, or blue marble is 1.
B. The probability of choosing a yellow marble is less than the probability of choosing a blue marble.
C. The probability of choosing a green marble is 0.25.
D. The probability of choosing a black marble is zero.
A. The probability of choosing a yellow, green, red, or blue marble is 1.
D. The probability of choosing a black marble is zero.
Note that the given bag does not have any black marble.
Statement B cannot be determined since the actual number of marbles is not given.
Statement C is not true. The probability of choosing a green marble is 5/20 or 1/4.
If P(blue) is 0.3, what is P(not blue)?
A. 0.3
B. 0.5
C. 0.6
D. 0.7
Which event is considered neither likely nor unlikely?
A. rolling a number greater than 1 on a six-sided number cube
B. rolling a 1 on a six-sided number cube
C. getting heads when flipping a coin
D. choosing an X, Y, or Z from a bag containing all the letters of the alphabet
P(not blue) = 1 - P(blue) = 1 - 0.3 = 0.7. Therefore, the answer is D. 0.7.
The event considered neither likely nor unlikely is A. rolling a number greater than 1 on a six-sided number cube. This event has an equal chance of happening or not happening. It has a probability of 0.666... or 2/3.