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Write the data in an increasing order:

40 60 79 80 90 90 98 99

Since the number of data is even, the median will be the average of the two data that are in the middle (80 and 90).

So the median of the data is 85, (80 + 90)/2.

Q: What is the median of 99 98 90 79 60 40 90 and 80?

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The result of the equation - 130 plus 40 plus 60 plus 80, is found as follows;130 + 40 + 60 + 80= ( 130 + 40 ) + 60 + 80= 170 + ( 60 + 80 )= 170 + 140= 310Answer = 310

The result of the equation - 130 plus 80 plus 60 plus 40, is found as follows;130 + 80 + 60 + 40= ( 130 + 80 ) + 60 + 40= 210 + ( 60 + 40 )= 210 + 100= 310Answer = 310

638.

61, 67,71, 73, and 79 are the prime numbers between 60 and 80.

85

20, 40, 60, 80, 100, 120 * * * * * These are the first six multiples!

median is 79. Write in order; median is middle number: {72, 89, 67, 81, 75, 79, 81, 80, 62, 64, 83} → {62, 64, 67, 72, 75, 79, 80, 81, 81, 83, 89} To find middle number, count the number of data items, add 1 and divide by 2. If this is a whole number, that is the data item which is the median; if it is a fraction, take the mean average of the data items of the positions either side of the fraction (eg if the fraction is 3.5, take the mean average of the 3rd and 4th data items) There are 11 data items → median is (11+1)/2 = 6th data item → median is 79

There are 5 prime numbers from 60 to 80:61, 67, 71, 73 and 79

Factors of 40: 1, 2, 4, 5, 8, 10, 20, 40.Factors of 80: 1, 2, 4, 5, 8, 10, 16, 20, 40, 80.Factors of 60: 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60.GCF (40, 80, 60) = 20

The first four multiples of 20 are: 20 40 60 80

Median of the set = arithmetic mean of 75 and 85 = 80