SAT Math : Data Analysis
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Example Questions
Example Question #1548 : Psat Mathematics
Set A:
Set B:
One letter is picked from Set A and Set B. What is the probability of picking two consonants?
Set A:
Set B:
In Set A, there are five consonants out of a total of seven letters, so the probability of drawing a consonant from Set A is 
In Set B, there are three consonants out of a total of six letters, so the probability of drawing a consonant from Set B is 
The question asks for the probability of drawing two consonants, meaning the probability of drawing a constant from Set A and Set B, so probability of the intersection of the two events is the product of the two probabilities:
Example Question #162 : Data Analysis
Set A:
Set B:
One letter is picked from Set A and Set B. What is the probability of picking at least one consonant?
Set A:
Set B:
In Set A, there are five consonants out of a total of seven letters, so the probability of drawing a consonant from Set A is 
In Set B, there are three consonants out of a total of six letters, so the probability of drawing a consonant from Set B is 
The question asks for the probability of drawing at least one consonant, which can be interpreted as a union of events. To calculate the probability of a union, sum the probability of each event and subtract the intersection:
The interesection is:
So, we can find the probability of drawing at least one consonant:
Example Question #163 : Data Analysis
Set A:
Set B:
One letter is drawn from Set A, and one from Set B. What is the probability of drawing a matching pair of letters?
Set A:
Set B:
Between Set A and Set B, there are two potential matching pairs of letters: AA and XX. The amount of possible combinations is the number of values in Set A, multiplied by the number of values in Set B, 
Therefore, the probability of drawing a matching set is:
Example Question #164 : Data Analysis
In a particular high school, 200 students are freshmen, 150 students are sophomores, 250 students are juniors, and 100 students are seniors. Twenty percent of freshmen are in honors classes, ten percent of sophomores are in honors classes, twelve percent of juniors are in honors classes, and thirty percent of seniors are in honors classes.
If a student is chosen at random, what is the probability that that student will be a student who attends honors classes?
First calculate the number of students:
The probability of drawing an honors student will then be the total number of honors students divided by the total number of students attending the school:
Example Question #101 : Probability
In a particular high school, 200 students are freshmen, 150 students are sophomores, 250 students are juniors, and 100 students are seniors. Twenty percent of freshmen are in honors classes, ten percent of sophomores are in honors classes, twelve percent of juniors are in honors classes, and thirty percent of seniors are in honors classes.
If a student is chosen at random, what is the probability that that student will be a senior student and a student who does not attend honors classes?
First calculate the number of students:
The percentage of seniors that do not attend honors classes is:
Therefore, the probability of selecting a student who is a senior and one who does not attend honors classes is:
Example Question #261 : Data Analysis
There is a bag of marbles that contains thre different color marbles, red, blue and green. There are 12 red, 15 blue marbles and 13 green marbles. There is also a coin with heads and tails that are equally likely. If a person were to randomly select a marble, while flipping a coin, what is the probability that a person will draw a blue marble and see tails on the coin flip?
The probability of selecting a blue marble is the number of blue marbles out of the total number of marbles:
The probability of seeing a tails is one half. Multiplying the probability of drawing a blue marble and seeing tails gives the probability of both events occurring.
The numerator and the demoninator have a common factor of 5 so that this fraction simplifies to:
Example Question #101 : Probability
A drawer contains 
The probability of choosing the first shirt of a certain color is 
The probability of choosing a second shirt of that color is now 
So the probability of choosing both the first shirt AND the second shirt is
Example Question #101 : How To Find The Probability Of An Outcome
11 cards are placed into a box numbered 5 - 15. If one card is randomly drawn from the box, what is the probabiltiy that a prime number will be on the card?
2/5
4/11
3/5
6/11
1/2
4/11
Possible numbers 5,6,7,8,9,10,11,12,13,14,15 (11 total numbers)
Prime numbers are 5,7,11,13 (4 total prime numbers)
totalnumber of prime numbers/ total numbers in box
Answer = 4/11
Example Question #3191 : Sat Mathematics
Which of the following would not change the probability that a randomly-drawn card from a standard deck of 52 will be a king?
Removing the hearts from the deck, and adding...
...the aces of spades from thirteen other decks.
...the clubs from another deck.
...the face cards and the joker from another deck.
...the twos from three other decks, plus the joker from a fourth deck.
...the aces, the twos, the threes, and the joker from another deck.
...the clubs from another deck.
Removing the hearts from the deck reduces the number of kings in the deck by one. Since each of the five choices involves replacing the thirteen cards with thirteen different cards, thereby keeping the number of cards constant, we want the choice that restores the number of kings to four - that is, the choice that involves adding exactly one king. The only choice that involves this is the choice to add the clubs from another deck.
Example Question #264 : Data Analysis
Balls are placed in a box, each marked with a letter. One ball is marked with an "A"; two balls are marked with a "B"; three are marked with a "C", and so forth up to twenty-six with a "Z".
A ball is drawn at random. Give the probability that the selected ball will be marked with a vowel.
Note: for purposes of this problem, "Y" is a consonant.
The number of balls placed in the box will be
The sum of the first 
so there are
balls in the box.
The five vowels are "A", "E", "I", "O", and "U", which are the first, fifth, ninth, fifteenth, and twenty-first letters of the alphabet. Consequently, there are
balls marked with vowels, and the probability of drawing one of these balls is
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