-The mean of 10 observations is 21. If each observation is multiplied by 4 and 5 is subtracted from each of them, then the mean will be

Related MCQs

• -The mean of ten observations is 23. If two observations 4 and 7 are substituted by 3 and 8, then the new value of mean will be
• -The mean of 100 items was found to be 40. If at the time of calculation two items were wrongly taken as 36 and 32 instead of 54 and 34, the correct mean is
• -The product of two positive numbers is 120 and the sum of their square is 289. The difference between them is
• 56-Six friends are sitting in a circle and are facing the centre of the circle. Deepa is between Prakash and Pankaj. Priti is between Mukesh and Lalit. Prakash and Mukesh are opposite to each other. Who is just right to Pankaj?
• -Six friends are sitting in a circle and are facing the centre of the circle. Deepa is between Prakash and Pankaj. Priti is between Mukesh and Lalit. Prakash and Mukesh are opposite to each other. Who is just right to Pankaj?
• -If the sum and difference of two numbers are 20 and 4, then the product is
• -If the fractions 5/6, 7/8, 6/7 and 8/9 are arranged in descending order then the correct sequence is:
• -If √p+√q=16 and √p-√q=8, then the value of p/q is
• -Ram if five time as old as shyam. If their differences of age is 8 years then how old is Ram?
• -If a:b=2:5, then the value of (2a+3b):(7a+5b) is