Statistics
The age of seven students are:
12, 13, 11, 14, 13, 15, 12
Find the range.
4
A fair six-sided die is rolled.
What is the probability of rolling a 4?
1/6
Solve:
x + 7 = 15
x = 8
What is the sum of angles in a triangle?
180 degrees
How many letters are there in the English alphabet?
26
Find the median of:
7, 2, 10, 9, 5, 12, 8
8
A bag contains 5 red marbles and 3 blue marbles.
What is the probability of selecting a blue marble?
3/8
Solve 5a = 45
a = 9
A triangle has angles of 45 degrees and 65 degrees. Find the third angle.
70 degrees.
What is the world's largest desert?
Antarctica
A student recorded the number of books read by five classmates:
3, 7, 5, 4, 6
Find the mean.
5
A spinner has equal sections numbered 1 to 8.
What is the probability of spinning an odd number?
4/8 = 1/2
Solve:
3x + 4 = 22
x = 6
Two angles on a straight line are 3x and 2x. Find x.
3x + 2x = 180
5x = 180
x = 36
Which Australian animal appears on the Australian coat of arms along with the kangaroo?
Emu
The following data have a mean of 12:
8, 10, 14, 16, x
Find the value of x.
12 x 5 = 60
8 + 10 + 14 + 16 = 48
x = 60 - 48
x = 12
A coin is tossed 40 times and lands heads 26 times.
What is the experimental probability of getting heads?
26/40 = 13/20
The sum of a number and twice the number is 36. Find the number.
x + 2x = 36
3x = 36
x = 12
Two parallel lines are cut by a transversal. One angle is 68 degrees. Find the co-interior angle on the same side of the transversal.
180 - 68 = 112
What is the largest organ in the human body?
skin
The median of the following data set is 18.
7, 9, 15, x, 21, 25, 30
Find the value of x
18
A bag contains red, blue and green counters.
The probability of selecting a red counter is 1/4.
The probability of selecting a blue counter is 1/2.
There are 8 green counters.
How many counters are in the bag?
Green probability = 1-1/4-1/2=1/4
If 1/4 represents 8 counters: 8 x 4 = 32 counters
A rectangle has a length that is 5 cm longer than its width.
Its perimeter is 50 cm.
Find the dimensions.
2(w+w+5) = 50
4w + 10 = 50
4w = 40
w = 10
Length = 15 cm
An isosceles triangle has a vertex angle of 44 degrees. Find the two equal angles.
180 - 44 = 136
136 / 2 = 68 degrees
What is the only mammal capable of true flight?
bat