The following table gives the installation time (in minutes) for hardware on 50 different computers.
Installation Time 0-10 10-20 20-30 30-40 40-50 Total
Number of computers 4 – 10 – 10 50
If the average installation time is 30.2 minutes, find missing frequencies.

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Installation Time	0-10	10-20	20-30	30-40	40-50	Total
Number of computers	4	–	10	–	10	50

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