1) A manufacturer states that their 1.5kg tins of chocolate contain a minimum of 60 chocolates. A sample of 20 tins of chocolates were selected and the number of chocolates in each tin was recorder. 63 58 63 57 60 62 57 72 60 61 56 63 62 63 58 61 63 59 58 60. a) calculate the mean media and mode. b ) calculate the range and interquartile range. c) how do the results obtained compare with the manufacturer claim of a minimum of 60 % in each tin?

The product of two negative rational numbers is always zero sometimes zero never zero

1- is the product of two rational numbers irrational or rational? first, make a hypothesis by multiplying two rational numbers. then, use variables such as x=a/b and y=c/d and the closure property of integers to prove your hypothesis. 2- what do you think the product of a nonzero rational number and an irrational number is? is it rational or irrational? make use of variables, the closure property of integers, and possibly a proof by contradiction to prove your hypothesis. 3- why do we have to specify that the rational number must be nonzero when we determine what the product of a nonzero rational number and an irrational number is? if the rational number were 0, would it give us the same result we found in part b?

Which expression demonstrates the use of the commutative property of addition in the first step of simplifying the expression (-1+i)+(21+5i)+0