Math test #2 Flashcards
What is the empty set
the set with no elements at all
What is the intersection of sets
elements in common to A and B
Only take the elements that are in both sets
What is the union of sets
elements in A or B
Take all elements from A or B but don’t repeat
What is the empty set a subset of
every set
Natural numbers
(every positive number 0,1,2,3,4…)
represented by an N
Integers
all numbers but not fractions or decimals
(-3,-2,-1,0,1,2,3)
represented by a Z
Rational numbers
all numbers including decimals and fractions
represented by a Q
real numbers
all numbers
represented by an R
plus after a symbol
means only positive numbers of the symbol
ex Z+ = positive integers
Compliments of a set
Represented by an apostrophe A’
means the opposite
what are disjoint sets
sets that dont intersect at all
How to find probability
number of elements / amount of numbers involved
how to make a stem and leaf diagram
- Organise the data into ascending order, smallest to largest;
- Determine how the numbers are split into 2 parts by writing a key for the stem and leaf diagram;
- Write the values for the ‘stem’ into the stem and leaf diagram;
- Write the values for the ‘leaf’ into the stem and leaf diagram.
how to make a frequency table
write the class intervals in one column.
Next, tally the numbers in each category based on the number of times it appears.
Finally, write the frequency in the final column.
how to make a histogram
Create a frequency table of the data for each interval. Make sure each interval is of equal length.
Title the histogram based on the problem. Label the horizontal axis with the intervals and the vertical axis with the frequencies.
Draw a bar over each interval that corresponds to its frequency