City Guilds Model Questions Vol1 2017 Information Technology Question 44
Practice objective / multiple choice question 44 from the 2017 City Guilds Model Questions Vol1 Information Technology examination.
Two hundred students were surveyed about the number of hours they spend on IT projects each week. The data were grouped as follows:\n\n- 0-4 hrs: 30 students\n- 5-9 hrs: 50 students\n- 10-14 hrs: 70 students\n- 15-19 hrs: 40 students\n- 20-24 hrs: 10 students\n\nAssuming a uniform distribution within each class, (i) estimate the mean and standard deviation of the weekly hours, (ii) if the school wishes to lower the overall mean by 10 % by reducing the hours of only the two highest groups (15-19 hrs and 20-24 hrs) while the lower three groups remain unchanged, by how many hours must the average weekly hours of those two groups be reduced (state the reduction per student and the total reduction)?
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About This Question
This is City Guilds Model Questions Vol1 2017 Information Technology Question 44. It is one of the objective questions from the 2017 City Guilds Model Questions Vol1 Information Technology examination.
Difficulty level: Hard .
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