Question

the marks obtained in an examination of 400 marks is given in the following frequency distribution table. find the mean of the distribution.

Answer 1

here is your answer. I hope this will help you

Answer 2

Mean of the distribution = 306.4

Step-by-step explanation:

Marks Class    Class Mean        Frequency        Class Mean * Frequency

200 - 240           220                 10                        2200

240 - 280           260                 20                        5200

280 - 320           300                 30                        9000

320 - 360           340                 24                        8160

360 - 400           380                 16                         6080

                          Total                100                       30640

Mean  = 30640/100

=> Mean = 306.4

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