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23) In a symmetrical distribution the mean, SD
and range of marks for a group of 20
students are 50, 10 and 30 respectiv

By Lyla

23) In a symmetrical distribution the mean, SD
and range of marks for a group of 20
students are 50, 10 and 30 respectively. Find
the SD of marks if the students with the
highest and lowest marks are excluded​

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Lyla

(1) The mean and standard deviation of marks of 500 students in an examination are 52 and 8 respectively. If the marks are normall

3. FILL IN THE BLANKS
The _______of a particular digit in a numeral is equal to the digit irrespective
of its placing in

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