# Answer to Question #45579 in Statistics and Probability for Monam Khan

Question #45579

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 say): 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

a) Calculate the standard deviation and mean.

b) According to Chebyshevâ€™s theorem, how many stays should be between 0 and 17 days? How many are actually in that interval?

c) How many stays can we expect between 0 and 17 days?

The data are:

Days (of hospital say): 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

a) Calculate the standard deviation and mean.

b) According to Chebyshevâ€™s theorem, how many stays should be between 0 and 17 days? How many are actually in that interval?

c) How many stays can we expect between 0 and 17 days?

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