Robin randomly selects a number between 1 and 20. What is the probability that the number selected is the square of a natural number?
1/2
3/20
3/10
1/5
1/3
since there are only 1,4,9,16 that are squares, 4/20 = 1/5
Only 1,4,9,16
4/20 = 1/5
Betty picks 4 random marbles from a bowl containing 3 white, 4 yellow, and 5 blue marbles.
The probability that exactly 1 of the 4 marbles drawn is blue is . The probability that at least 1 of the 4 marbles drawn is white is .
I need help
To find the probability that the number Robin selects is the square of a natural number, we need to determine the number of favorable outcomes (squares of natural numbers) and the total number of possible outcomes.
The squares of natural numbers between 1 and 20 are: 1, 4, 9, 16.
The total number of possible outcomes is all the numbers between 1 and 20, which is 20.
Therefore, the probability is given by the number of favorable outcomes divided by the total number of possible outcomes.
So, the probability is 4 (number of favorable outcomes) divided by 20 (total number of possible outcomes), which gives us 4/20.
Simplifying 4/20 gives us 1/5.
Therefore, the probability that the number selected by Robin is the square of a natural number is 1/5.