percentage and fraction
Express 3/10 as a percentage
30%
50%
0.5
what percentage is 20 meters out of 100 meters?
20%
The complement of green is
Not green
Census
Express 75% as the simplest fraction
3/4
75%
0.75
what percent is 40 out of 50 marks
80% Double or nothing
A bag with 15 marbles has 7 green marbles. Pr(Green') is equal to?
8/15
Express 1.2 as a percentage
120%
4/100
0.04
what percent is 40cm out of 2 m
20%
Consider the list 2, 3, 4, 5, 7, 8. What is the probability a number is chosen that is an odd number or over 4 but not both.
Odd numbers 3, 5, 7
Numbers over 4 are 5, 7 and 8
Numbers in both groups 5 and 7
So only 3 and 8 are allowed so probability is 2/6 or 1/3.
Our school has 1100 students. A teacher completed a survey of 10 students in year 8. When they spoke to the Principal they said that the result is biased. Explain why the Principal believed the result could be biased (hint there are two reasons).
Two answers:
The sample is very small
The year 8 students do not represent all of the different groups in the school.
Express 300% as a number
3
8%
0.08
what is $87.50 out of $350.00 as a percentage
25%
A survey found that there were 7 people who liked both pink and green. There were 9 people who only liked green and a total of 50 people in the survey. What is the probability of not liking green?
Probability of not green is 34/50.
A sample set of data has the numbers 4, 5, 6, x, 9, 10.
If the median is 7.5 what is x?
x = 9
The middle number between 6 and 9 is 7.5.
Express 115% as a fraction
23/20
7 1/4
7.25 Double or nothing
What is 12 out of 96 as a percentage
12.5%
A survey of 100 households found that 35 had a cat, 45 had a dog. There were 30 households without a pet.
How many households had both a cat and a dog?
A set of 6 numbers has a mean of 25 and an outlier of 50. If the outlier was removed what would be the new mean?
Total value is 6 x 25 = 150
Remove 50 so new total is 100 with 5 numbers.
Mean is 100/5 = 20.