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If the mean of 10 observations is 20 and that of another 15 observations is 16. Find the mean of all 25 observations?

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Which is the best website for learning class 9 maths?
You can search for professional all over India from urbanpro.com. It will provide you with best tutors.
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Is tuition important for Class 10?
Tutions are needed to give you proper guidance.,to clear your basics ..In schools mostly your syllabus runs very fast but in tutions you can cover each and every aspect of the subject which your class teachers also miss sometimes..
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Cards, marked with numbers 5 to 50, are placed in a box and mixed throughly. A card is drawn from teh box at random. Find the probability that the number on the taken out card is: (i) a prime number less than 10. (ii) a number which is a perfect square." "
The sample size is 46 (i) The prime numbers less than 10 are 5 and 7. so the probability is 2/46 or 1/23. (ii) The perfect squares are 9,16,25, 36 and 49-five in all so the probability is 5/46
Akhil
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Can a second year BTech student take tuition for classes 9 and 10?
Yes , definitely because this time 2nd year students have enough time so then can take easily tuition for class 9 10 .
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