Mean of 10 items was found to be 15. On verification, it was found that an item 21 was miscopied as 12. The correct mean is
- 15.9
- 14.1
- 24
- none of these
The Correct Option is A
Solution and Explanation
Top Questions on Statistics
- Find 'mean' and 'mode' of the following data : Frequency Distribution Table
Class 0 – 15 15 – 30 30 – 45 45 – 60 60 – 75 75 – 90 Frequency 11 8 15 7 10 9 - The mean deviation from the median for the following data is:
\[ \begin{array}{c|ccccc} x_i & 9 & 3 & 7 & 2 & 5 \\ f_i & 1 & 6 & 2 & 8 & 4 \\ \end{array} \]- AP EAPCET - 2025
- Mathematics
- Statistics
- Two students appeared simultaneously for an entrance exam. If the probability that the first student gets qualified in the exam is \( \frac{1}{4} \) and the probability that the second student gets qualified in the same exam is \( \frac{2}{5} \), then the probability that at least one of them gets qualified in that exam is
- AP EAPCET - 2025
- Mathematics
- Statistics
Variance of the following discrete frequency distribution is:
\[ \begin{array}{|c|c|c|c|c|c|} \hline \text{Class Interval} & 0-2 & 2-4 & 4-6 & 6-8 & 8-10 \\ \hline \text{Frequency (}f_i\text{)} & 2 & 3 & 5 & 3 & 2 \\ \hline \end{array} \]- AP EAPCET - 2025
- Mathematics
- Statistics
- The mean and variance of the observations \( x_1, x_2, x_3, \dots, x_{15} \) are respectively 2 and 4. If the mean and variance of the observations \( Y_1, Y_2, \dots, Y_{10} \) are respectively 2 and 5, then the variance of the observations \( x_1, x_2, \dots, x_{15}, Y_1, Y_2, \dots, Y_{10} \) is:
- AP EAPCET - 2025
- Mathematics
- Statistics
Concepts Used:
Statistics
Statistics is a field of mathematics concerned with the study of data collection, data analysis, data interpretation, data presentation, and data organization. Statistics is mainly used to acquire a better understanding of data and to focus on specific applications. Also, Statistics is the process of gathering, assessing, and summarising data in a mathematical form.
Mathematically there are two approaches for analyzing data in statistics that are widely used:
Descriptive Statistics -
Using measures of central tendency and measures of dispersion, the descriptive technique of statistics is utilized to describe the data collected and summarise the data and its attributes.
Inferential Statistics -
This statistical strategy is utilized to produce conclusions from data. Inferential statistics rely on statistical tests on samples to make inferences, and it does so by discovering variations between the two groups. The p-value is calculated and differentiated to the probability of chance() = 0.05. If the p-value is less than or equivalent to, the p-value is considered statistically significant.