For an upcoming government project, you are required to find the average height of the students in Class VIII of a given school. Instead of asking every student, you took a few students as your sample and noted their heights in the table given below. Roll Number Height8012 121.92 cm8045 133.21 cm8053 141.34 cm8099 126.23 cm8125 175.74 cmQuestion 2/3MandatorySamplingWhat is the mean of the sample?133.21139.69146.76141.34
Question
For an upcoming government project, you are required to find the average height of the students in Class VIII of a given school. Instead of asking every student, you took a few students as your sample and noted their heights in the table given below. Roll Number Height8012 121.92 cm8045 133.21 cm8053 141.34 cm8099 126.23 cm8125 175.74 cmQuestion 2/3MandatorySamplingWhat is the mean of the sample?133.21139.69146.76141.34
Solution
To find the mean (average) of the sample, you need to add up all the heights and then divide by the number of students.
Here are the steps:
- Add up all the heights: 121.92 cm + 133.21 cm + 141.34 cm + 126.23 cm + 175.74 cm = 698.44 cm
- Count the number of students: There are 5 students in the sample.
- Divide the total height by the number of students: 698.44 cm / 5 students = 139.688 cm
So, the mean height of the students in the sample is approximately 139.69 cm.
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