ആദ്യത്തെ 7 ഒറ്റ സംഖ്യകളുടെ ശരാശരി എന്ത് ?
A5
B9
C7.3
D7
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തുടർച്ചയായ 5 എണ്ണൽ സംഖ്യകളുടെ ശരാശരി 13 ആയാൽ അവയിൽ ആദ്യത്തെ സംഖ്യയേത് ?
The mean marks obtained by 300 students in a subject are 60. The mean of top 100 students was found to be 80 and the mean of last 100 students was found to be 50. The mean marks of the remaining 100 students are: