All ISEE Lower Level Math Resources
Example Questions
Example Question #51 : Probability
If Rebecca rolls a pair of dice, what is the probability that the sum an even number?
If Rebecca rolls a pair of dice, the potential numbers that she could roll are below:
Thus, there are 11 possible numbers that she could roll, of which 6 are even.
Therefore, the probability of rolling an even number is .
Example Question #52 : Probability
If Alicia makes 1 out of 7 of the soccer goals that she attempts, how many goals will she score if she attempts 49 goals (assuming that her accuracy rate remains the same)?
If Alicia makes 1 out of 7 of the soccer goals that she attempts, this means that she makes of her attempted soccer goals.
If Alicia makes 49 soccer goal attempts, she will score on of them. Given that of 49 is 7, the correct answer is 7.
Example Question #53 : Probability
If Mary rolls a pair of dice, what is the probability that the the sum will be a multiple of 4?
When a pair of dice is rolled, there are 11 possibilities.
The multiples of 4 are 4, 8, and 12.
Therefore, the probability of rolling a multiple of 4 is .
Example Question #54 : Data Analysis And Probability
If 1 in 5 corgis will develop back problems, what are the odds that Virgo, a 6 month old corgi, will develop back problems?
20 percent
10 percent
50 percent
40 percent
20 percent
Given that Virgo is a corgi, and that 1 in 5 corgis develop back problems, there is a 20 percent chance that Virgo will develop back problems. This is because 1 divided by 5 is .2, which is equivalent to 20 percent.
Example Question #54 : Data Analysis And Probability
In a cupboard there are mugs, glasses and plastic cups. If someone randomly reaches into the cupboard and grabs one of these items, what is the probability that he or she will pull out a mug?
To write probability as a fraction, put the number of things that match what you're looking for in the numerator and the total number of things in the denominator. In this case, what we're looking for is mugs. There are mugs, so we'll put in the numerator. The total number of things in the cupboard is mugs glasses cups. , so we'll put in the denominator. This gives us , which we can simplify to . The correct answer is .
Example Question #55 : Data Analysis And Probability
What is the probabily of getting or when you roll a die?
There are equally likely outcomes when rolling a die so each one of them has a probability of . When you are finding the probability of a intersection, one event or another happening, you add the probabilities together. So the probability of rolling a plus the probability of rolling a equals .
Example Question #55 : How To Find The Probability Of An Outcome
A bag has red marbles, green marbles, and blue marbles. What is the probability of NOT drawing a red marble on the first draw?
Recall that a probability is the likelihood of something occurring.
Mathematically, we can write probability as the following:
For this question, we do not want a red marble. This means that we are trying to find the proability of drawing either a blue or a green marble. Since we have blue marbles and green marbles, we have wanted outcomes. Since there is a total of marbles, we have a total of possible outcomes.
The probability then becomes the following:
Example Question #56 : How To Find The Probability Of An Outcome
If you randomly choose a number between , inclusive, what's the proability the number will be divisible by ?
Recall that a probability is the likelihood of something occurring.
Mathematically, we can write probability as the following:
First, write down the possible wanted outcomes:
Now, because there are numbers divisible by three, we have wanted outcomes.
Since we are choosing numbers between and , inclusive, we have a total outcomes.
The probability then can be written as the following:
Example Question #57 : Data Analysis And Probability
If you randomly choose a number between , inclusive, what is the probability that the number is less than ?
Recall that a probability is the likelihood of something occurring.
Mathematically, we can write probability as the following:
First, write down the possible wanted outcomes:
Now, because there are numbers that are less than , we have wanted outcomes.
Since we are choosing numbers between and , inclusive, we have a total outcomes.
The probability then can be written as the following:
Example Question #54 : Outcomes
If you randomly choose a number between , inclusive, what is the probability that the number is negative?
Recall that a probability is the likelihood of something occurring.
Mathematically, we can write probability as the following:
First, write down the possible wanted outcomes. However, since all the numbers we are choosing from are negative, we have wanted outcomes.
Since we are choosing numbers between and , inclusive, we have a total outcomes.
The probability then can be written as the following:
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