Class 11

Math

JEE Main Questions

Statistics

Find the mean deviation about the mean for the data : Income 0-100 100-200 200-300 300-400 400-500 500-600 600-700 700-800per dayNumber 4 8 9 10 7 5 4 3of persons

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The following data gives the information on the observed lifetimes (in hours) of $225$ electrical components:

Calculate the media from the following frequency distribution:

Find the mean and variance for the data

The distance (in km) of 40 engineers from their residence to their place of work were found as follows:$519712 310914 101272 201789 251836 1111515 13321215 717157 1216186 312312 $

A survey reading the heights (in $cm$) of $50$ girls of a class was conducted and the following data was obtained:

Compute the mean of the following data :

If the S.D. of a set of observations is 8 and if each observation is divided by -2, the S.D. of the new set of observations will be (a) -4 (b) -8 (c) 8 (d) 4

The following frequency distribution gives the monthly consumption of electricity of $68$ consumers of a locality. Find the median, mean and mode of the data and compare them.