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Answer on Statistics and Probability Question 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 Chebyshev’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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