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Statistics Class 9 PPT

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FAQs on Statistics Class 9 PPT

1. What are the measures of central tendency in statistics?
Ans. In statistics, measures of central tendency are used to describe the center, or average, of a set of data. The most common measures of central tendency are the mean, median, and mode. The mean is calculated by summing all the values in the data set and dividing by the number of values. The median is the middle value when the data set is arranged in order, and the mode is the value that appears most frequently.
2. How is the mean calculated?
Ans. The mean is calculated by summing all the values in a data set and dividing the sum by the number of values. For example, if we have the data set {2, 4, 6, 8, 10}, the mean is calculated as (2 + 4 + 6 + 8 + 10) / 5 = 6.
3. What is the difference between the mean, median, and mode?
Ans. The mean is the average of a set of data and is calculated by summing all the values and dividing by the number of values. The median is the middle value when the data set is arranged in order, and it represents the value that divides the data into two equal halves. The mode is the value that appears most frequently in the data set.
4. How is the median calculated?
Ans. To calculate the median, the data set is first arranged in order from smallest to largest. If the data set has an odd number of values, the median is the middle value. If the data set has an even number of values, the median is the average of the two middle values.
5. What is the mode in statistics?
Ans. In statistics, the mode refers to the value that appears most frequently in a data set. It is not necessary for a data set to have a mode, and it is possible for a data set to have multiple modes if more than one value appears with the same highest frequency.
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