NPTEL Data Analytics with Python Week 3 Assignment Answers 2025
1. The specific value of a random variable is called estimator
- True
- False
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2. If the true proportion of customers who are below 20 years is P=0.35, what is the probability that a sample size 100 yields a sample proportion between 0.3 to 0.4
- 0.961
- 0.827
- 0.706
- 0.53
Answer :-
3. Stratified random sampling is a method of selecting a sample in which
- the sample is first divided into strata, and then random samples are taken from each stratum
- various strata are selected from the sample
- the population is first divided into strata, and then random samples are drawn from each stratum
- None of these alternatives is correct
Answer :-
4. The interval estimate provides more information about a population characteristics than the point estimate
- True
- False
Answer :-
5. A question paper contains 90 multiple choice questions. There are 4 alternative answers (A, B, C or D) out of which only one is correct. Mr X answers these questions randomly (i.e. without preparation). What is the probability that X gets a score of at least 10 marks?
- 0.9997
- 0.7894
- 0
- 0.001
Answer :-
6. On an average 5 % items supplied by manufacturer X. are defectives. If a batch of 10 items is inspected: what is the probability that 2 items are defective
- 0.065
- 0.075
- 0.085
- 0.095
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7. A car distributor in city Y experiences on an average 2.5 car sales per day. Find the probability that on a randomly selected day, they will sell 5 car:
- 0.0668
- 0.544
- 0.082
- 0.205
Answer :-
8. In question 7, Find the probability that on a randomly selected day, they will sell no cars:
- 0.0668
- 0.544
- 0.082
- 0.205
Answer :-
9. In question 7, Find the probability that on a randomly selected day, they will sell at most 2 cars
- 0.0668
- 0.544
- 0.082
- 0.205
Answer :-
10. In question 7, Find the probability that on a randomly selected day, they will sell exactly one car:
- 0.0668
- 0.544
- 0.082
- 0.205
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