CBSE Class 10 Maths Arithmetic Mean of Grouped Data

• what is the class inteval for 6-10,10-14,14-20,20-28,28-38
• find the mean of 20 numbers such that if the mean of 8 of them is 10 and the mean of 10 of them is 12 the last two numbers are 8 and 12
• 9.If the mean of the following data is 91.Find the missing frequency :- C. I.            Frequency 0-30.             12 30-60.           21 60-90.            X  90-120.         52 120-150.        Y  150-180.        11 Total              150
• by assume mean method
  
• Statistics
• solve
  
• what is statistics
• assumed mean method
• Write formula for find out the mean of the data using assumed mean
  
• Mean of 100 numbers was found to be 50. But later on, it was observed that one of the number 150 was wrongly taken as 50

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