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**Statistics**: A branch of mathematics dealing with the collection, analysis, interpretation, and presentation of masses of numerical data.

**Data**: Collection of meaningful informations.

Two types of Data: Ungrouped data and Grouped data

Measure of Central Tendency: It means a center or location of the distribution. The most common measures of central tendency are the arithmetic mean, the median, and the mode

Empirical relationship between three measures of central tendency: Mode = 3 Median – 2 mean

**Median class**: A class where the cumulative frequency reaches half the sum of the absolute frequencies.

**Modal Class**: A class interval having maximum frequency.

**Q.** Find the range of the observations 255,125,130,160,185,170,103.

**Q.** Find the mean of first 5 prime numbers.

**Q.** The difference between upper limit and lower limit is known as _____________

**Q.** The Empirical relationship between three measures of central tendency is ______________________

**Q.** The median and mode respectively of a frequency distribution are 26 and 29, Then its mean is

**Q.** If the difference of mode and median of a data is 24, then the difference of median and mean is