41.
Match the following.
List-I List-II
a. Range 1. Summing up the consecutive frequencies
b. Width of the interval 2. Range/Number of classes
c. Open ended class 3. Highest value-lowest value in data
d. Cumulative frequency 4. No lower limit of first group or no upper limit of the last group

45.
Harmonic mean is calculated by dividing the number of observations by the reciprocal of each number in the series. Thus, the harmonic mean is:

47.
Match the following.
List-I List-II
a. Diagrammatic representation 1. Geographical, chronological, qualitative, quantitative
b. Graphic representation 2. Ungrouped, grouped
c. Frequency distribution 3. Bar diagram, pie chart, pictogram
d. Classification of data 4. Histogram, frequency polygon, ogive

48.
Which of the following is correct?
1. Large sample, n > 30
2. Small sample, n < 20
3. Probability of type I error (α) is also called significance level of least.
4. Accepting the null hypothesis, when it is false is called type II error.
Select the correct answer using the options given below