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**(1) The word â€˜dataâ€™ means information. Its exact dictionary meaning is" given facts".**

**(2) Statistical data are of two types (i) primary (ii)secondary.
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**(ii) Secondary:
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**(3) The number of times an observation occurs in the given data is called the frequency of the observation.
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If this is done for all the observations and the data is rearranged from the lowest to the highest value; frequency distribution is obtained.

**(4) There are two types of frequency distribution:
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81,55,68,79,85,43,29,68,54,73,47,35,72,64,95,44,50,77,64,35,79,52,45,54,70,83,62,64,72,92,84,76,63,43,54,38,73,68,52,54.

Prepare a frequency distribution with class size of 10 marks.

Â Â Â Â Minimum mark = 29

Â Â Â Â Maximum mark = 95

Now,

Â Â Â Range = 95-29= 66

It is given that the class of size is 10

Then, no. of classes = Range/ Class Size = 66/10 = 6.6

Frequency distribution of marks-

**(ii) Â Continuous frequency distribution:
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(5) In a discrete frequency distribution the cumulative frequency of a particular value of the variable is the total of all the frequencies of the values of the variable which are less than or equal to the particular value.

**Solution:
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A table which shows the commutative frequencies over various classes is called a cumulative frequency distribution table.

**(6) A table which displays the manner is which cumulative frequency are distributed over various classes is called a cumulative frequency distribution or cumulative frequency table.
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