HARD
11th ICSE
IMPORTANT
Earn 100

Calculate the standard deviation from the following data: (Write the answer up to two decimal places.)

Mid-point 5 15 25 35 45 55 65 75
Frequency  5 8 7 12 28 20 10 10

Important Questions on Statistics

MEDIUM
11th ICSE
IMPORTANT
The mean and variance of 8 observations are 9 and 9.25 respectively. If the six observations are 6,7,10,12,12 and 13, find the remaining two observations.
EASY
11th ICSE
IMPORTANT
Weekly average wages of workers in a factory increase from  80 to  120 and standard deviation increases from  10 to  30. Have the wages become less uniform now?
HARD
11th ICSE
IMPORTANT

From the following, find which series is more consistent:

Variables 10-20 20-30 30-40 40-50 50-60 60-70
Series A 10 16 30 40 26 18
Series B 22 18 32 34 18 16