Show:
Factoring
Limits/Derivatives
Z-Score
Probability
Math Riddles
100
(x^2-16)
(x+4)(x-4)
100
Evaluate the limit as x approaches 8: (6x^2 + 6)(5x + 8)
18720
100
A normal distribution has a mean of 98 and a standard deviation of 5. Find the z-score for a data value of 81.
-3.4
100
A die is rolled twice. What is the probability of showing a 5 on the first roll and an even number on the second roll?
1/12
100
What number do you get when you multiply all of the numbers on a telephone's number pad?
0
200
(3y^2 + 12y)
3y(y + 4)
200
Evaluate the limit as x approaches 5: (4x^2 + 4)(5x + 4)
3016
200
On a recent quiz, the class mean was 76 with a standard deviation of 2.1. Calculate the z-score for a person who received a score of 73.
-1.43
200
If the probability of the Seattle Mariners winning the World Series is 2/25, what is the probability of the Mariners not winning?
23/25
200
What 3 positive numbers give the same result when multiplied and added together?
1, 2, and 3
300
(x^3 - 8)
(x - 2)(x^2 + 2x + 4)
300
Evaluate the limit when x approaches -3: (8x^2 - 3x + 3)/(x - 7)
-8.4
300
Adult men have heights with a mean of 69 inches and a standard deviation of 2.8 inches. Find the z-score of a man 72.1 inches tall
1.11
300
Suppose that 38% of people own dogs. If you pick two people at random, what is the probability that they both own a dog?
361/2500
300
Mr. Smith has 4 daughters. Each of his daughters has a brother. How many children does Mr. Smith have?
5
400
(6x^2 + 5x - 6)
(3x - 2) (2x +3)
400
Evaluate the limit as x approaches 1: (x^3 - 1) / (x^2 - 1)
1
400
The hourly salary rate for accountants follow a normal distribution, with a mean of $27 and a standard deviation of $4. Tom earns $22.50 an hour. His z score is:
-1.125
400
From a group of 10 people, you choose 5 at random. What is the probability that they are the 5 oldest people in the group?
1/252
400
How can you add eight 8's to get the number 1,000?
888 + 88+ 8 + 8 + 8 = 1000
500
(2x^2 + 4x + 7)
No solution
500
Evaluate the limit as x approaches 36: (36 - x ) / (6- sqrt(x))
12
500
Kyle scores a 491 on an exam with a mean of 380 and a standard deviation of 72, while Ryan scores a 41 on an exam with a mean of 28 and a standard deviation of 2.5. Which do you think is more likely to be accepted at the college of their choice?
Ryan
500
A bag contains 9 red marbles, 8 white marbles, and 8 blue marbles. You draw 3 marbles out at random. What is the probability that exactly two marbles are red?
144/575
500
A merchant can place 8 large boxes or 10 small boxes into a carton for shipping. In one shipment, he sent a total of 96 boxes. If there are more large boxes than small boxes, how many cartons did he ship?
11 cartons total 7 large boxes (7 * 8 = 56 boxes) 4 small boxes (4 10 = 40 boxes 11 total cartons and 96 boxes