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There are an infinite list of different sets of 5 that do that.
If their mean is 80, then the only thing you know about them is that they add up to 400.
Here's one set:
78, 79, 80, 81, 82
Here's another one:
79, 81, -600, 400, 440.
The mean doesn't tell us anything about what the individual numbers must be.
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What is the range of 80 90 90 95 100?
The range of a set of numbers is the difference between the highest and lowest values. In this case, the highest value is 100 and the lowest value is 80. Therefore, the range of the numbers 80, 90, 90, 95, and 100 is 20.
If one three-digit number is chosen at random from all those that can be made from the above set of digits find the probability that one is not multiple of 5?
An interesting question. The answer is 80%. A number must end in 0 or 5 to be dividable by 5. From 100 to 109 (10 numbers in total), there will be 2 numbers that are dividable by 5. If I then consider the entire set from 100 to 999 is 900 numbers, you have 90 sets of 10 numbers, each set with 2 dividable number, or 180/900 = 2/10 =20%. If 20% are dividable, 80% aren't. Suppose I extended the question, and say my set is all whole positive numbers and zero with n digits or less, where I pick n randomly from 1 to a million. If from this set, a number is picked randomly, what is the chance that it is dividable by 5. Answer: 20%.
What is the mean for 80 85 76 70 87 80 90 80 90?
82.
What two numbers when multiplied give you -80 and when added give you -11?
-91
What fraction of 20 is 2.25?
Multiply both numbers by 4 to get rid of the .25 and you have the equivalent question, "what fraction of 80 is 9?" The answer is 9/80
