Neco 2018 Data Processing Question 21
Practice objective / multiple choice question 21 from the 2018 Neco Data Processing examination.
A set of test scores is grouped into intervals of width 10 as shown below. The frequencies for the first nine intervals are: \(0\text{-}9\): 5, \(10\text{-}19\): 7, \(20\text{-}29\): 9, \(30\text{-}39\): 11, \(40\text{-}49\): 13, \(50\text{-}59\): 15, \(60\text{-}69\): 17, \(70\text{-}79\): 19, \(80\text{-}89\): 21. The frequency for the last interval \(90\text{-}99\) is unknown. If the overall mean score of the 124 students is 57, determine the missing frequency.
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About This Question
This is Neco 2018 Data Processing Question 21. It is one of the objective questions from the 2018 Neco Data Processing examination.
Difficulty level: Medium .
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