Counting Strategies
What is the value of 4!
24
What is the mean? {11,14,11,5,17,28,3}
12.71
What percentage of the players weigh between 178 lbs and 194 lbs?
47.5%
Some test papers are usually distributed with a standard deviation of 5.If one student scored 83 with a z-score of -0.4,what is the mean?
85
Solve: 4x-36=8x+16
x=-13
What is the Formula for when order matters?
nPr (Permutations)
What is the median: {58,53,59,51,46,35,51,58,60}
53
What is the probability that a player weighs less than 162 lbs or greater than 194 lbs?
5%
The mean number of total miles ran last week was 4 with a standard deviation of 1.2.If someones z-score was 2.5,how many miles did the athlete run?
7.0
What's the square root of 121?
11
How many ways can someone choose a committee of 3 students from a group of 5?
10 (5C3 )
Find the mode & median:{21,10,27,24,15,7,19,24,31,15,11,24}
Median =20, Mode=24
A total of 120 tests were distributed with a mean of 82 and a standard deviation of 5: what percent of the scores are between 72 and 87?
81.5%
On a math test,scores are usually distributed with a mean of 75 and standard deviation of 10.Sarah scored 85.
1
3(4x-17)= 4(6x+13)
103/-12 or -8.58
What is the factorial of 12*11*10*9*8*7*6*5*4*3*2*1 ?
12!
Find the standard deviation:{3.4,7,8,11,12,12,15,19}
5.16
The time taken to travel between two regional cities is approximately normally distributed with a mean of 50 minutes and a standard deviation of 2 minutes: What is the percentage of travel times that are between 46 and 54 minutes?
95%
The average height of students at school is 65 inches with a standard deviation of 4 inches.Jake is 73 inches tall.What is his z-score?
2
Solve: (6x+24)(7x+19)
42x2+274x+456
How many ways can a president, vice president, and secretary be chosen from a club of 6 people?
120 (6P3)
Find the standard deviation: {25,27,21,32,35,29,23,26,24,25,28,31}
4.04
A total of 120 tests were distributed with a mean of 82 and a standard deviation of 5: About how many students scored outside two standard deviations of the mean?
6 ( 5% of 120)
The average time to finish a race is 50 minutes with a standard deviation of 5 minutes.Emma finishes in 40 minutes so what is her z-score?
-2
3(2x2+3x-9)-4(8x2+7x+13)
-26x3+37x2-79