The following data represent the minimum waiting time (in seconds) for a sample of twenty customers waiting to be served by a teller of ABC bank. 9, 12, 15, 20, 21, 29, 33, 40, 45, 50, 55, 60, 63, 66, 25. Required; a. Construct a grouped frequency distribution for the data using class intervals 1-10, 11- 20, 30-40, etc. b. Using your frequency distribution, calculate the mean and standard deviation c. Using your frequency distribution, calculate the median and mode

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 3. The following data represent the minimum waiting time (in seconds) for a sample of twenty customers waiting to be served by a teller of ABC bank. 9, 12, 15, 20, 21, 29, 33, 40, 45, 50, 55, 60, 63, 66, 25.

Required;

a. Construct a grouped frequency distribution for the data using class intervals 1-10, 11- 20, 30-40, etc.

b. Using your frequency distribution, calculate the mean and standard deviation

c. Using your frequency distribution, calculate the median and mode. Dr. Godwin Musah

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Data is given for 20 customers 

We have to construct grouped frequency table and we have to calculate mean, median, mode and standard deviation.

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