Take your time to read instructions before taking this test.

There are 40 questions which you are to answer in 15 minutes that gives you roughly 30 seconds per question.

If you can get at least 60%, you can be rest assured that you’ll ace STA 112 exam

In a normal exam you will be asked between 40 – 60 questions but I only arranged 40 questions

Note

Do not be in a hurry to answer the questions
Do not waste time on a question you don’t know
Move as fast as possible and starting with questions that don’t have calculation first to save time
Always crosscheck
Don’t be in a hurry to submit, you are not in a competition
Don’t be scared. Getting an A is easy
Don’t be over confident, you can end up a D, E or F. Calm your blood, no be only you sabi book
Please do well to use our comment box incase there’s a message you want to pass to us

70 – 100 A

60 – 69 B

50 – 59 C

45 – 49 D

40 – 44 E

0 – 39 F

I wish you success

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STA 112

1 / 40

1. Outcome of a coin toss is considered

A. Certain

B. Fixed

C. Biased

D. Random

2 / 40

2. Probability of an event A is calculated by

A. n(A) × n(S)

B. n(A) – n(S)

C. n(S)/n(A)

D. n(A)/n(S)

3 / 40

3. Number of ways to choose 3 red balls or more is

A. 10

B. 5

C. 7

D. 9

4 / 40

4. Sample space of tossing two coins is

A. 4

B. 8

C. 2

D. 6

5 / 40

5. Total arrangements of 7 Physics, 6 Biology, 5 Chemistry books together is

A. 7! + 6! + 5!

B. 3 × 18!

C. 7! × 6! × 5! × 3!

D. 18!

6 / 40

6. Total arrangements of 7 Physics, 6 Biology, 5 Chemistry books together is

A. 3 × 18!

B. 18!

C. 7! × 6! × 5! × 3!

D. 7! + 6! + 5!

7 / 40

7. In a sample of 10 students with 6 successes, probability p is

A. 0.8

B. 0.6

C. 0.2

D. 0.4

8 / 40

8. In Poisson distribution, mean equals

A. λ

B. x

C. q

D. p

9 / 40

9. For p = 0.6, the variance of Bernoulli is

A. 0.16

B. 0.24

C. 0.42

D. 0.36

10 / 40

10. Mean of a binomial distribution is

A. n × p

B. p × p

C. p/q

D. n × q

11 / 40

11. Variance of binomial is

A. p² × q

B. q/p

C. n × p × q

D. n/p

12 / 40

12. Variance of Bernoulli distribution is

A. p/q

B. p × q

C. q/p

D. p + q

13 / 40

13. Bernoulli trial is characterized by

A. Two outcomes

B. Three outcomes

C. Zero outcomes

D. Infinite outcomes

14 / 40

14. X ~ Bi(10, 0.5), probability x = 4 is

A. 0.320

B. 0.156

C. 0.205

D. 0.184

15 / 40

15. Permutation differs from combination by focusing on

A. Total outcomes

B. Order of arrangement

C. Probability

D. Group size

16 / 40

16. Probability describes

A. Precision of measuring tools

B. Degree of uncertainty in events

C. Value of currency

D. Speed of calculation

17 / 40

17. Probability of success in a Bernoulli trial is denoted by

A. q

B. r

C. x

D. p

18 / 40

18. Assigning 5, 3, and 2 nurses to 3 departments from 10 nurses is

A. 10P3

B. 10C5 × 10C3 × 10C2

C. 10! / (5! × 3! × 2!)

D. 5C3 × 3C2 × 2C1

19 / 40

19. Ways to select 3 from 5 students (combination) is

A. 30

B. 15

C. 6

D. 10

20 / 40

20. Standard deviation of a distribution equals

A. √(mean)

B. √variance

C. ∑x²

D. mean × x

21 / 40

21. Binomial distribution models

A. Continuous experiments

B. Multiple Bernoulli trials

C. Random permutations

D. One-time trials

22 / 40

22. Mean of Bernoulli distribution is

A. pq

B. p

C. q/p

D. q

23 / 40

23. X ~ Bi(10, 0.5), P(1 ≤ x ≤ 3) equals

A. 0.176

B. 0.308

C. 0.118

D. 0.1709

24 / 40

24. Choosing at least 3 of first 4 questions yields

A. 5P2

B. 3C2 + 11

C. 4C4 × 4C3

D. 4C3 × 4C2 + 4C4 × 4C1

25 / 40

25. Selection of 5 questions from 8 without compulsion gives

A. 5P3

B. 8C3

C. 5!

D. 8C5

26 / 40

26. Tossing three coins gives a sample space of

A. 8

B. 2

C. 6

D. 4

27 / 40

27. Probability of selecting 3 balls with at least 1 white from 2 white and 3 red is

A. 12

B. 12

C. 10

D. 9

28 / 40

28. In Poisson, λ = 1.44, P(2 ≤ x ≤ 4) is

A. 0.560

B. 0.406

C. 0.089

D. 0.223

29 / 40

29. Tossing three coins gives a sample space of

A. 4

B. 6

C. 2

D. 8

30 / 40

30. For n = 3, x = 2, p = 0.3, binomial probability is

A. 0.25

B. 0.18

C. 0.12

D. 0.189

31 / 40

31. Distinct arrangements of the word “Economics” is

A. 30240

B. 45360

C. 90720

D. 60480

32 / 40

32. 4! (4 factorial) is equal to

A. 24

B. 16

C. 36

D. 10

33 / 40

33. P(x ≤ 2) in Bi(10, 0.5) equals

A. 0.543

B. 0.998

C. 0.810

D. 0.05469

34 / 40

34. Number of six-digit numbers from digits 4,4,6,6,6,6 is

A. 90

B. 60

C. 120

D. 150

35 / 40

35. For n = 3, x = 2, p = 0.3, binomial probability is

A. 0.18

B. 0.189

C. 0.12

D. 0.25

36 / 40

36. Number of ways to seat 3 people in 6 seats is

A. 720

B. 20

C. 120

D. 360

37 / 40

37. First 3 questions compulsory from 8 gives

A. 5C3

B. 5C2

C. 3C2

D. 8C2

38 / 40

38. Mean of a probability distribution is given by

A. ∑x/P(x)

B. ∑x²P(x)

C. ∑xP(x)

D. ∑x/x

39 / 40

39. A discrete random variable assumes

A. Countable outcomes

B. Any real number

C. Infinite values

D. Imaginary results

40 / 40

40. Poisson probability for x = 3, λ = 1.44 is

A. 0.089

B. 0.151

C. 0.1179

D. 0.125

Your score is

The average score is 40%

FUOYE STA 112 CBT Practice

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