Answers

2015-02-08T14:13:28+05:30

mean of the marks of the girls = total score of the girls / 30

73 = x /30

therefore x = 2790

same for the boys

total score = 20 * 71 = 1420

therefore the total score of the class = 1420 + 2790 = 4210

the mean of the class = 4210/50 =84.5



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2015-02-08T18:47:59+05:30
Mean scores scored by boys = 71
Mean scores scored by girls = 73

Mean scores =   \frac{71 + 73}{50}
 \frac{144}{50}
= 2.88 
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