Count the Ways
A quiz has 3 multiple choice questions (A through D) followed by 4 true false questions. How many are there to answer the quiz?
512
Ariel's grades are 87 82 79 91 84 86.
Find the mean and the median
Round to the nearest tenth.
Mean 84.8
Median 85
Suppose Taylah's z-score for the 800m is -1.8. What does this mean?
The mean time bus riders spend on the bus is 21 minutes with a standard deviation of 4.5 minutes. What percent of students are on the bus between 21 and 30 minutes?
47.5%
Solve (write answer as a fraction)
(x-4)/5=(5-2x)/3
x=37/13
How many ways are there for 6 people to line up in a line?
720
Josh got the exact same grade on every assignment. What is the standard deviation of his grades?
0
Suppose the average battery life of the new JBL Flip 7 is 18.5 hours with a standard deviation of 2.1 hours. Jayla's speaker lasted 22.5 hours. Find the z score.
1.90
The average time bus riders spend on the bus is 21 minutes with a standard deviation of 4.5 minutes. What percent spend at most 16.5 minutes?
16%
Multiply
(5-3i)(5+3i)
34
How many ways are there to arrange the letters in the word ALGEBRA ?
2520
If the mean number of tardies per student this semester is 12.5 with a standard deviation of 2.4. How many tardies is 2 standard deviations above the mean?
17.3 (Just add 2.4 twice to the mean)
Suppose the average distance to school for Indian River Students is 2.3 miles with a standard deviation of 0.4 miles. Jayden's z score is -1.6. How far does Jayden live from school?
About 1.7 miles (1.66)
The average time bus riders spend on the bus is 21 minutes with a standard deviation of 4.5 minutes. About how many students spend at least 16.5 minutes on the bus if 780 students ride the bus?
0.84*780=655.2 which rounds to 655 students.
What is the domain of the function
f(x)=sqrt(x-4)
x>4
Sweet Frog has 10 flavors. You are going to pick 3 flavors to put in a large cup. How many ways can you choose 3 flavors?
120
Suppose the grades on a quiz in a class are 84 88 92 90 86 78 82 84 89 93.
Two days later a student who was absent makes up the quiz and gets a 20.
Which measurement will be affected more by the new grade, the mean or the median?
The mean will be affected more.
The standard deviation of the school's Biology SOL was 13.5. Markus' score of 462 was 2.5 standard deviations above the mean. What was the school mean (average)?
About 428 (428.25)
The average amount of money a family spends on a week vacation is $3450 dollars with a standard deviation of $375. What percent of families spend no more than $3000?
11.5%
Factor
15x^2+13x-3
(5x-1)(2x+3)
There are 18 students in the key club. How many ways are there to assign a President, a Vice President, a Treasurer, and a Recorder?
73440
Suppose Chad's quiz grades so far are 80 92 and 76. What is the minimum grade Chad needs to get on the next quiz in order to have a mean (average) of 85?
92
The average time it takes Ryan to cut a lawn is 1.2 hours. He cut a lawn that took him 1.6 hours and the z score was 2.1. Find the standard deviation.
0.19
The average price a customer pays at a car repair shop is $1895 with a standard deviation of $495. What percent of customers spend between $1000 and $2000?
54.9%
The domain of the function f(x) below is all real numbers except what two numbers? Hint: you CANNOT have 0 in the denominator of a function.
f(x)=1/(x^2+x-20)
-5 and 4