Grade 7/8 Statistics and Probability
Find the mode of the numbers 3,5,5,7,8,5
5
The marks scored by 5 students are: 10,12,15,18,20. Find the mean?
Mean = 15
Find the median of the data: 6, 9, 11, 14, 18, 21
12.5
Convert the fraction 3/4 to decimal
0.75
Write the ratio of 6 apple to 4 oranges in it simplest form
3:2
Find the median of : 2,4,6,8,10,12
7
A die is rolled once, what is the probability of getting a multiple of 3.
2/6 or 1/3
Find the range of the following data: 7,10, 15,19,22
15
Convert 0.6 to a fraction in its simplest term
3/5
Simplify the ratio 35:42
5:6
Find the mean of the numbers: 4,6,8,10,12
Mean = 8
Two dice are rolled. Find the probability of getting a sum of 7.
Possible sums are: (1,6), (3,4), (2,5),( 4,3), (5,2), (6.1)
6/36=1/6
A die is rolled once. Find the probability of getting an odd number.
3 outcomes
3/6 or 1/2
A shop sold 60 pens. 2/5 of them were red. How many red pens were sold?
24 pens
A bag contains red, blue, and green balls in the ratio 3:2:5. If there are 50 balls in total, how many are blue?
10
A bag contains 3 red marbles, 2 blue marbles and 4 green marbles. What is the probability of picking a red marble?
3/9 or 1/3
A card is chosen from a deck of 52 cards. find the probability of selecting a king
4
4/52=1/13
The probability that a student passes an exam is 0.85. Find the probability that the student fails.
0.15
Express 0.875 in its simplest form
7/8
A mixture contains milk and water in the ratio 5:2. If 35 liters of mixture is needed, how much milk and water should be used?
25 L milk,10L water
A card is chosen from a deck of 52( a pack of cards). What is the probability of selecting a heart?
13/52 or 1/4
Find the range of the data set: 6,9,11,15,18
12
A bag contains 4 red balls, 3 blue balls and 3 green balls. What is the probability that the two balls are the same color?
4/15
200 students sat their end of term exams.Out of the 200 students only 45% passed the exam. How many students passed the end of term exam?
90
Three numbers are in the ratio 2:3:4. Their sum is 72. Find the numbers
16,24, 32