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Data Handling — Chapter Test

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Q1
Which measure is the most frequent value in a data set?
The mode is the most frequent value.
Q2
The probability of a certain event is ___ ?
A certain event has probability 1.
Q3
The probability of an impossible event is ___ ?
An impossible event has probability 0.
Q4
Range = highest value − ___ ?
Range = highest − lowest.
Q5
What is the mean of 4, 6, 8, 10?
(4 + 6 + 8 + 10) ÷ 4 = 28 ÷ 4 = 7.
Q6
What is the median of 3, 5, 7, 9, 11?
The middle value is 7.
Q7
What is the mode of 2, 4, 4, 6, 4?
4 appears most often.
Q8
What is the range of 12, 5, 8, 20?
Range = 20 − 5 = 15.
Q9
What is the probability of getting a head on a fair coin?
1 head out of 2 outcomes, so ½.
Q10
What is the probability of rolling an even number on a fair die?
Even numbers 2, 4, 6 give 3/6 = ½.
Q11
A student scores 70, 80 and 90. What is the mean?
(70 + 80 + 90) ÷ 3 = 80.
Q12
A bag has 3 red and 2 blue balls. What is the probability of drawing a red ball?
3 red out of 5 balls, so 3/5.
Q13
The mean of 5 numbers is 12. What is their sum?
Sum = mean × count = 12 × 5 = 60.
Q14
What is the median of 6, 8, 8, 10, 13?
In order, the middle (third) value is 8.
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