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Probability and statistics revision quiz
Probability and statistics revision quiz
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1
Fill in the gap. The more tosses, the more......the estimate of the probability of getting heads.
unreliable
reliable
2
Ata girls' school, what is the p(female U maths)?
42/42
7/42
12/42
23/42
3
60 tosses. Relative frequency × total tosses = estimated total heads. Head's relative frequency is
13
/
30
. No. of heads?
13/30 of 60 tosses = 13
13/30 of 60 = 26
4
How many did do the homework on this frequency tree?
3
39
45
6
5
What is the probability of picking a black sweet...?
1/6
5/6
4/5
1/5
6
How do we find the mean?
total (frequency * data value) divide total frequency
highest data value -lowest data value
take an average of the score column
score with the highest frequency
7
What is the modal number of...?
2
7
8
1
8
Which has a mode of 3, a median of 5 and a range of 6?
3, 3, 5, 8, 9
3, 3, 5, 7
3, 4, 4, 5, 7
3, 3, 5, 9
9
What does p(chocolate') mean?
chocolate
cold chocolate
hot chocolate
not chocolate
10
We multiply the probability of independent events. Using the tree diagram, p(HH)?
1/4
1/2
11
30 tosses of a coin. 13 were heads. What is the relative frequency of getting heads?
17/30
13/30
0.13
13:30
12
In a sample there is 0.7 chance of finding red sweets. If there are 50 sweet, how many are red?
0.7 × 50 = 40
0.7 × 50 = 30
0.7 × 50 = 35
0.7 × 50 = 45
13
Using the tree diagram, find the probability of getting a head a tail.
1/2
0
1/4
1
14
Sample space diagrams are used
to give people space
list all of the probabilities
to list all of the possible outcomes
15
What are all charts need?
Labels
Labels and a title
Labels, a title and a scale
pies
16
What is the p(hard copy ∩ kindle)?
60
12/60
12
30/60
17
What is the correlation on the scatter graph?
weak negative correlation
negative correlation
Strong positive correlation
no correlation
18
What does '∩' mean?
or
both
not
19
The probability of it raining is 0.71. What is the probability of it not raining?
0.19
0.29
0.39
0.71
