Experimental Probability

Experimental probability is when you do an experiment and get results from the experiment, whether or not they differ from the theoretical probability.

Divisible

Divisible means when a number can be divided by another number with no remainders/ it is a whole number.

The divisibility rules

The rules show when a number is divisible by that number
0- when the number ends in 0
1- All numbers
2- All even numbers
3- If the sum of all the digits equal to something that can be divided by 3, it is.
4- It's divisible by two twice
5- If it ends in 5 or 0.
6- If it is divisible by 2 and 3
8- If divisible by 2 thrice.
9- If the sum of the digits is divisible by 9
10- ends in 0

An outlier

An outlier is a number that is either too small or too big compared to other numbers in a data set.
e.g 5, 5, 6, 7, 1000
The outlier is 1000

Range

The range of a data set is when you subtract the smallest value from the biggest value.
E.g 4, 5, 6, 7
7 - 4 = 3
The range is 3

The Median

The median is the middle number in a data set, or the mean of two middle values
E.g 3, 4, 5 , 6, 7
In this the median is 5
Another e.g 3, 4, 6, 7
4 + 6 = 10
10  ÷ 2 = 5.
The median for this is 5.

The mode

The mode is the easiest for data sets
It is the most frequently shown number in a data set
Example: 1,1,1,1,1,2,2,2,3
The mode is 1.

The mean

To find the mean in a data set, you must take all the values, add them together and then devide that number by the number of values.
Example: 1, 2, 3, 4, 5
1 + 2 + 3 + 4 + 5 = 15
15 ÷ 5 = 3
The mean is 3

Homework Booklet Chapter 7.4 Question 7.

Homework Booklet Chapter 7.4 question 10.
Lars ran 6 2/3 laps of the track at his school. Reneta ran 8 1/4 laps.
A) How much faster did Reneta run? Show your work.
First I turned 1/4 and 2/3 into a common denominator, which is 12.
1/4 X 3 = 3/12.
2/3 X 4 = 8/12
So after that I subtract 8/12 from 3/12 but you can't do that 'cause you'd get -8/12 or something. So you take a whole number, change 8 to 7 and now it's 15/12 - 8/12 which is 7/12.
Then 7-6 = 1.
1 + 7/12 = 1 7/12
B) Check your answer using estimation.
6 2/3 rounded off to7.
8 1/4 rounded off to 8
8 - 7 =1.

Practice Test question 3

Practice Test question 2.

This is question 2 of the practice test.

Page 223 queston 17.

Jack is making vegetable dip for a party.
He needs 2/5 of a jar of mayonnaise to make it. The jar is 4/5 full. He drops it and only 1/5 is left.
a) Does he have enough left in the jar to make the dip? If not, how much more would he need?
b) How much of the jar spilled out?

a) He needs 2/5 so 1/5 is not enough. He would need 1/5 more.
b) 1/5 +3/5 would = 4/5 so he would have spilled 3/5

Textbook page 214 queston 6.

This is old but I couldn't post it before.
6. Write each addition statement shown by the fraction strips. Estimate the answer then add.

Chapter 04 review.

I did question 9.
The cost of a backpack is 60% of the cost of a shirt.
a) If the shirt costs $32.60, how much does the backpack cost?
b) What is the total price of the backpack and shirt before tax?

Page 137 number 5.

I did Page 137 number 5.