Question

1. Fill in the blanks
a) -10,-15,-20,__
b) 123×42__×123
2. State true or false
a) The sum of two odd numbers is an odd number.
3. Write the mathematical expression of the following.
"Subtract 9 from the sum of 6 and 8"
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Answer 1

There are several kinds of mean in mathematics, especially in statistics. For a data set, the arithmetic mean, also called the expected value or average, is the central value of a discrete set of numbers: specifically, the sum of the values divided by the number of values.