BMN-528 Data Science and Big data analytics: Quiz
Total Marks: 25
1. Which of the following is not a measure of dispersion?
a. Skewness
b. Kurtosis
c. Range
d. Percentile
Answer : Percentile
2. The values of the variate that divide a set of data into four equal parts after arranging the
observations in ascending order of magnitude are called:
a. Quartiles
b. Deciles
c. Percentile
d. None of these
Answer : Quartiles
3. If the values of mean, median and mode coincide, then the distribution is:
a. Skewed to the left
b. Skewed to the right
c. Symmetrical
d. None of these
Answer : Symmetrical
4. The sum of deviations taken from mean is:
a. Always equal to 0
b. Never equal to 0
c. Some times equal to 0
d. None of these
Answer : Always equal to 0
5. The elimination of extreme scores at the top of the set has the effect of:
a. Lowering the mean
b. Raising the mean
c. No effect
d. Can’t say
Answer : Lowering the mean
6. The scores of students are 40, 45, 49, 53, 61, 65, 71, 79, 85, 91. What is the percentile for
score 71?
a. 50
b. 60
c. 75
d. None of these
, Answer : 60
7. A variable that can assume any value between two given points is called:
a. Continuous random variable
b. Discrete random variable
c. Irregular random variable
d. Uncertain random variable
Answer : Continuous random variable
8. The expected value of a discrete random variable ‘x’ is given by:
a. 1
b. P(x)
c. ∑ P(x)
d. ∑ x P(x)
Answer : ∑ x P(x)
9. What percentage of scores fall within 3 standard deviations from the mean for normal
distribution?
a. 50 %
b. 67.8 %
c. 95 %
d. 99.7 %
Answer : 99.7 %
10. For a certain Poisson distribution if P(3) = P(4), what is the value of λ for this distribution?
a. 1
b. 2
c. 4
d. 6
Answer : 4
11. An automobile plant contracted to buy shock absorbers from two suppliers X and Y. X
supplies 60% and Y supplies 40% of the shock absorbers. All shock absorbers are subjected
to a quality test and the ones that pass the test are considered qualified. 96 % of shock
absorbers from Xare reliable, whereas 72% of shock absorbers are reliable. The probability
that a randomly chosen shock absorber which is found to be reliable is made by Y is _____
a. 0.288
b. 0.334
c. 0.667
d. 0.72
Answer : 0.334
12. Find the expected value of a random variable which has the following distribution?
X 2 4 6 8 10
P 0.1 0.3 0.4 0.1 0.1
a. 5.2
Total Marks: 25
1. Which of the following is not a measure of dispersion?
a. Skewness
b. Kurtosis
c. Range
d. Percentile
Answer : Percentile
2. The values of the variate that divide a set of data into four equal parts after arranging the
observations in ascending order of magnitude are called:
a. Quartiles
b. Deciles
c. Percentile
d. None of these
Answer : Quartiles
3. If the values of mean, median and mode coincide, then the distribution is:
a. Skewed to the left
b. Skewed to the right
c. Symmetrical
d. None of these
Answer : Symmetrical
4. The sum of deviations taken from mean is:
a. Always equal to 0
b. Never equal to 0
c. Some times equal to 0
d. None of these
Answer : Always equal to 0
5. The elimination of extreme scores at the top of the set has the effect of:
a. Lowering the mean
b. Raising the mean
c. No effect
d. Can’t say
Answer : Lowering the mean
6. The scores of students are 40, 45, 49, 53, 61, 65, 71, 79, 85, 91. What is the percentile for
score 71?
a. 50
b. 60
c. 75
d. None of these
, Answer : 60
7. A variable that can assume any value between two given points is called:
a. Continuous random variable
b. Discrete random variable
c. Irregular random variable
d. Uncertain random variable
Answer : Continuous random variable
8. The expected value of a discrete random variable ‘x’ is given by:
a. 1
b. P(x)
c. ∑ P(x)
d. ∑ x P(x)
Answer : ∑ x P(x)
9. What percentage of scores fall within 3 standard deviations from the mean for normal
distribution?
a. 50 %
b. 67.8 %
c. 95 %
d. 99.7 %
Answer : 99.7 %
10. For a certain Poisson distribution if P(3) = P(4), what is the value of λ for this distribution?
a. 1
b. 2
c. 4
d. 6
Answer : 4
11. An automobile plant contracted to buy shock absorbers from two suppliers X and Y. X
supplies 60% and Y supplies 40% of the shock absorbers. All shock absorbers are subjected
to a quality test and the ones that pass the test are considered qualified. 96 % of shock
absorbers from Xare reliable, whereas 72% of shock absorbers are reliable. The probability
that a randomly chosen shock absorber which is found to be reliable is made by Y is _____
a. 0.288
b. 0.334
c. 0.667
d. 0.72
Answer : 0.334
12. Find the expected value of a random variable which has the following distribution?
X 2 4 6 8 10
P 0.1 0.3 0.4 0.1 0.1
a. 5.2
