The mean of 10 numbers is 15 and that of another 20 numbers is 24. The mean of all the thirty numbers
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The mean of all thirty numbers is 21.
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answer is 21
Step-by-step explanation:
mean of 10 numbers = 10 ×15 = 150
mean of 20 numbers is 20×24=480
mean of 30 observation will be mean of 10 no + mean of 20 no. ÷ 30
150+480/30 = 630/30=21
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