# SSAT Upper Level Math : Data Analysis / Probablility

## Example Questions

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### Example Question #61 : Data Analysis / Probablility

The above set of balls is placed in a box. Give the probability that, if a ball is drawn at random, it will be a gray ball marked with a number that is a multiple of 3.

Explanation:

Of the twenty-five balls in the box, five are both gray and marked with a number that is a multiple of 3 (3, 6, 90), as seen in the figure below:

This makes the probability of drawing one of these balls

.

### Example Question #32 : Probability

Above is a part of the board for a popular board game. Terry is moving clockwise on the board; his playing piece is represented by the black triangle. He is about to roll a pair of fair six-sided dice. He collects $10,000 every time he lands on or passes the space marked "Onward!" What are the odds in favor of, or against, him collecting$10,000 on this turn?

5 to 1 against

11 to 1 against

5 to 1 in favor

11 to 1 in favor

11 to 1 in favor

Explanation:

Terry will collect $10,000 if he rolls a four or higher. As can be seen in the diagram below, out of thirty-six equally probable outcomes possible with the roll of two fair six-sided dice, there are only three rolls unfavorable to this outcome, and thirty-three favorable: This makes the odds , or 11 to 1, in favor of$10,000 being collected on this turn.

### Example Question #62 : Data Analysis / Probablility

In the game of Crazy Eights, which is played with an ordinary deck of 52 playing cards, each player lays down a card from his hand on top of a discard pile according to the card that has previously been played. The card he is allowed to play must be a card of the same rank or suit, or it must be an eight of any suit.

At the beginning of the hand, the seven of diamonds was turned over; Kenny, who was first, played a six of diamonds on top of it. Dick, who plays next, has the following cards in his hand:

As can be seen, Dick does not have a playable card. By the rules, he must draw a card, and, if he can play it, he must. What is the probability that the card he draws will be playable?

Explanation:

Dick knows 10 of the cards the deck - the eight in his hand, and the two in the discard pile. Of the other  cards, the following are playable:

The four eights;

The other three sixes (hearts, clubs, spades); and,

The other ten diamonds (the six and the seven have been played, and the eight of diamonds has already been counted).

This makes

of the 42 cards playable, so the probability that a playable card will be drawn is .

### Example Question #34 : Probability

In the game of Crazy Eights, which is played with an ordinary deck of 52 playing cards, each player lays down a card from his hand on top of a discard pile according to the card that has previously been played. The card he is allowed to play must be a card of the same rank or suit, or it must be an eight of any suit.

At the beginning of the hand, the two of clubs has been turned over. Brenda has in her hand eight cards, as follows:

As can be seen, Brenda cannot play a card. By the rules, she must draw a card, and, if she can play it, she must. What is the probability that the card she draws will be playable?

Explanation:

Brenda knows nine of the cards - the one in the discard pile and the eight in her hand. Therefore, the next card can be one of  different cards. The playable cards are:

The four eights;

The other three twos (hearts, spades, diamonds); and,

The other eleven clubs (the two has been played, and the eight of diamonds has already been counted).

This makes

of the 42 cards playable, so the probability that a playable card will be drawn is .

### Example Question #31 : Probability

In a jar, there are 3 blue marbles, 5 red marbles, 8 green marbles. If Bob reaches his hand in a jar, and grabs one marble, what is the likelihood he will pick up a blue marble?

Explanation:

First, calculate the total number of marbles in the jar, which is . Because 3 of the marbles are blue, the chances of picking a blue marble .

### Example Question #61 : Data Analysis / Probablility

A fair six-sided die has on its faces the numbers 1, 1, 1, 2, 2, 3; a fair eight-sided die has on its faces the numbers 1, 1, 1, 1, 2, 2, 3, 4. If both dice are rolled, what is the probability that the numbers add up to 3 or less?

Explanation:

In order for the roll to add up to 3 or less, neither die can come up 3 or 4. Therefore, we look at the probabilities that each die can come up 1 and 2.

The six-sided die comes up 1 with probability ; it comes up 2 with probability .

The six-sided die comes up 1 with probability ; it comes up 2 with probability .

A roll of 3 or less can happen three ways:

Case 1: Both dice come up 1. The probability of this, by the Multiplication Principle, is

Case 2: The six-sided die comes up 1 and the eight-sided die comes up 2. The probability of this, by the Multiplication Principle, is

Case 3: The six-sided die comes up 2 and the eight-sided die comes up 1. The probability of this, by the Multiplication Principle, is

These are mutually exclusive events, so add these probabilities:

### Example Question #1691 : Ssat Upper Level Quantitative (Math)

Looking at the following data set, would this distribution be normally distributed, skewed to the left, or skewed to the right?

Skewed to the right

Normally distributed

Skewed to the left

Skewed to the right

Explanation:

The data has two large outliers that are to high compare to the rest of the data.  That means they fall far to the right of the distribution.  This leads to a right tail for the data curve and that makes it skewed to the right.

### Example Question #64 : Data Analysis / Probablility

Jim counted the number of visitors he had each day for a period.  The graph provided shows the amount of days that he got 1, 2, 3, 4, or 5 visitors.  After looking at the data, what is the mode amount of visits?