Q.1 The administration department of PIMS Hospital Islamabad surveyed the number of days 400 randomly chosen patients stayed in the hospital after an operation.
The data are:
Days (of hospital stay): 1 - 3 4 - 6 7 - 9 10 - 12 13 - 15 16 - 18 19 - 21 22 - 24
Frequency: 36 18 88 42 18 18 8 10
I). Calculate the standard deviation and mean.
ii). According to Chebysshev ’s theorem, how many stays should be between 0
and 17 days? How many are actually in that interval?
Iii). How many stays can we expect between 0 and 17 days?

Q.1 The administration department of PIMS Hospital Islamabad surveyed the number of days 400 randomly chosen patients stayed in the hospital after an operation.
The data are:
Days (of hospital stay): 1 - 3 4 - 6 7 - 9 10 - 12 13 - 15 16 - 18 19 - 21 22 - 24
Frequency: 36 18 88 42 18 18 8 10
I). Calculate the standard deviation and mean.
ii). According to Chebysshev ’s theorem, how many stays should be between 0
and 17 days? How many are actually in that interval?
Iii). How many stays can we expect between 0 and 17 days?

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