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Consider the following grouped frequency distribution, which portrays the duration (in minutes) of 50 lectures delivered by a Chemistry professor

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Consider the following grouped frequency distribution, which portrays the duration (in minutes) of 50 lectures delivered by a Chemistry professor. Duration (Minutes) Frequency 30.00 < 40.00 3 40.00 < 50.00 7 50.00 < 60.00 18 60.00 < 70.00 13 70.00 < 80.00 8 80.00 < 90.00 1 Using computational formalue, calculate the: i) estimated mean. ii) mode. iii) standard deviation.