Statistika dan Peluang Practice Questions
UN (Indonesia) · UN Matematika · 141 free MCQs with instant results and detailed explanations.
141
Total
37
Easy
83
Medium
21
Hard
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Sample Questions from Statistika dan Peluang
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Q1
Easy
The mode of the following set of numbers: 2, 3, 4, 4, 5, 5, 5, 6 is?
A.
4
B.
5
C.
6
D.
2
Show Answer & Explanation
Correct Answer: B
The mode is the number that appears most frequently in the data set. Here, 5 appears three times which is more than any other number.
Q2
Easy
A bag contains 3 red balls and 2 blue balls. What is the probability of randomly picking a red ball?
A.
0.6
B.
0.4
C.
0.5
D.
0.3
Show Answer & Explanation
Correct Answer: A
The probability of picking a red ball is the number of red balls divided by the total number of balls. 3/(3+2) = 3/5 = 0.6.
Q3
Easy
If the median of the following data set: 1, 3, 4, 6, 8 is found, what is the median?
A.
3
B.
4
C.
5
D.
6
Show Answer & Explanation
Correct Answer: B
The median is the middle number when the data is sorted. Here, the sorted data has 5 numbers, so the median is the 3rd number: 4.
Q4
Medium
A dataset contains the following values: 12, 15, 20, 15, 10. What is the mode of the dataset?
A.
10
B.
12
C.
15
D.
20
Show Answer & Explanation
Correct Answer: C
The mode is the value that appears most frequently in a dataset. In this case, the number 15 appears twice, while all other numbers appear only once. Therefore, the mode is 15.
Q5
Medium
In a class of 30 students, 18 students are taking Mathematics, and 12 students are taking Science. If 6 students are taking both subjects, how many students are taking only Mathematics?
A.
12
B.
18
C.
6
D.
24
Show Answer & Explanation
Correct Answer: A
To find the number of students taking only Mathematics, we subtract the number of students taking both subjects from those taking Mathematics: 18 - 6 = 12.
Q6
Medium
If the probability of an event occurring is 0.3, what is the probability of the event not occurring?
A.
0.7
B.
0.3
C.
1.3
D.
0.5
Show Answer & Explanation
Correct Answer: A
The probability of an event not occurring is calculated as 1 minus the probability of the event occurring. Thus, 1 - 0.3 = 0.7.
Q7
Medium
A survey of 100 people shows that 65 like coffee, 50 like tea, and 20 like both. What percentage of surveyed people like only coffee?
A.
45%
B.
20%
C.
50%
D.
30%
Show Answer & Explanation
Correct Answer: A
To find the percentage of people who like only coffee, calculate: 65 (coffee) - 20 (both) = 45, then (45/100) * 100 = 45%.
Q8
Hard
A factory produces two types of products, A and B. The probability of producing product A is 0.6, and the probability of producing product B is 0.4. If a product is randomly selected, what is the probability that it is not product A?
A.
0.6
B.
0.4
C.
0.16
D.
0.8
Show Answer & Explanation
Correct Answer: B
The probability of not producing product A is calculated as 1 - P(A) = 1 - 0.6 = 0.4, making option B the correct answer.
Q9
Hard
In a survey, the ages of 50 respondents are recorded. The mean age is found to be 30 years, and the variance is 25 years². What is the standard deviation of the ages of the respondents?
A.
5 years
B.
30 years
C.
25 years
D.
15 years
Show Answer & Explanation
Correct Answer: A
The standard deviation is the square root of the variance. Given variance = 25, the standard deviation = √25 = 5 years, making option A the correct answer.
Q10
Hard
A group of students scored the following marks in a mathematics test: 72, 85, 90, 66, 78, 90, 85, 60. What is the mode of their scores?
A.
85
B.
90
C.
72
D.
66
Show Answer & Explanation
Correct Answer: A
The mode is the number that appears most frequently in a data set. Here, 85 appears twice, which is more than any other score.
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Statistika dan Peluang — UN (Indonesia) UN Matematika Practice Questions Online
This page contains 141 practice MCQs for the chapter Statistika dan Peluang in UN (Indonesia) UN Matematika. The questions are organized by difficulty — 37 easy, 83 medium, 21 hard — so you can choose the right level for your preparation.
Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit.