Mean
The mean of the following is: 2,8,12,15,3,6,8,1,4,14,12,3,3
What is 7?
what are the variance and standard deviation of a spinner with 4 equal wedges and the values 3,8,13,20
variance = 53.14
standard deviation=7.29
We use z-scores ____________.
What is to make comparisons between data that don't use the same scale?
you make your free throw shots 32% of the time, your mean and std. dev. on 50 shots are____ and _____
What is mean =16 and std. dev.=3.30
You have a spinner with a mean of 3 and std dev. of 2 and you triple all the values on it what are the new mean, std dev, and variance
What are mean=9, Std. Dev.=6 and Variance=36
Use the data to find the mean:
X. 1 2 5 9
frequency. 2 3 2 5
What is 5.25?
Measurements are taken in units of feet. _____ are the units for standard deviation and ______ are the units for variance of the data.
What are feet for standard deviation and feet squared for variance?
The z-score for a male in the 20-29 age group whose height is 71.1 inches is ____. mean = 69.6 standard deviation = 3
What is 0.5?
You are having a bad dream - guessing on your MC Bio Test of 80 questions (you have a 25% chance of getting one correct) what are the mean and std dev. of guessing on 80 MC questions
What is Mean= 20 correct and Std dev. =3.87
You have a job where your hours have a weekly mean of 20 and a std. deviation of 5. Your mean and standard deviation of your weekly pay (at 15$/ hour+50$/week) are ______
Mean =$350, Std. Dev. =$75
The mean is ____ compared to the median on a skewed right set of data
What is greater than?
if you have spinner A with mean 7 and std. dev. of 3 and spinner B with mean 9 and std dev. of 4 what are the mean and standard deviation of the sum of the spinners?
What is mean of 16 and std. dev. of 5?
The z-score for a male in the 20-29 age group whose height is 66.3 inches is ____. mean = 69.6 standard deviation = 3
What is z-score = -1.1?
You roll 50 dice the mean and standard deviation of the sum (the numbers for 1 die are 3.5 = mean and 1.71=std dev)
What is 175= mean and Std dev.=12.08
Why does the mean of (x+c)= the mean of (x)+c
(x1+c)+(x2+c)+...(xn+c)=
(x1+x2+...+xn+c+c...+c)/n
=mean of (x) + nc/n = mean of (x)+c
The is the grade for a student in a class with the following grades and weights:
Tests: weight - 15% each; grades - 75%, 82%, 93%, 86%
Homework: weight - 10%; grade - 95%
Exam: weight - 30%; grade - 80%
What is 83.9?
The standard deviation for the sample: 4,2,9,12,15,3,6,8,1,4,14,12,3,3
What is 4.596? or 4.60?
A student took two tests - biology and statistics. They did better (relative to their peers) on the _____ test.
Statistics Test = 78, mean = 63, std dev = 7
Biology Test = 29, mean = 23, std dev = 3.9
What is Statistics Test?
The formulas for mean and standard deviation of repeated Bernoulli trials are (with n trials and a p probability of success)
mean = NP
Std. Dev. =sqrt(N*P*(1-P))
Why does Mean (XC)=C *Mean X
What is X1C+X2C+...XnC=C*(X1+X2+...Xn)/n=
C*Mean X