Z-Scores
A z-score measures how many of these a value is from the mean
standard deviations
This type of graph is symmetric and shaped like a bell
Normal distribution
A restaurant offers 4 types of sandwiches , 3 types of drinks, and 2 types of dessert. How many different meals can be made?
4x3x2=24 24 meals
3x2 + 2x - 5 = 0 What is the formula for this equation
ax2 + bx + c = 0
What is the mode?
The number that appears the most
A z-score of 0 means the value is equal to this
Mean
In a normal distribution,the mean, median and mode are all this
equal
How many ways can 3 students be chosen from 8 students to receive 1st, 2nd, and 3rd place?
8P3=336 336 ways
What are the solutions to x2 - 9 = 0?
x = 3, x = -3
What is the average of a set of numbers called?
Mean
If a z-score is negative the value is located where relative to the mean
Below the mean
Approximately 68% of data in a normal distribution falls within this many standard deviations of the mean
1 standard deviation
How many ways can a committee of 4 people be chosen from 10 people?
210 committees
What is the quadratic formula
write on board
What is the middle value in an order called?
Median
The formula used to calculate a z-score
subtracting the mean from x, then dividing the result by the standard deviation
According to the Empirical Rule,A approximately 95% of data falls within this many standard deviations of the mean
2 standard deviations
How many 3-digit PIN codes can be made using digits 0-9 if repetition is allowed?
10x10x10=1000 1000 PIN codes
what is the square root of 64
8
Find Mean 4,6,8,10,12
8
The mean score is 70 and the standard deviation is 5. A student scores 80.Find the z-score
2
According to the Empirical Rule, approximately 99.7% of data falls within this many standard deviations of the mean
3 standard deviations
How many different arrangements can be made from the letters in the word LEVEL?
2L 120/4 = 30 30 arrangements
2E
16
Find median 3,7,9,12,15,18,21,24
13.5C