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Step 1: Find the sum of all numbers → 1+2+3+4+5 = 15

Step 2: Divide total by the number of numbers → 15 ÷ 5 = 3

Grades:

Step 1: Sort the list → 1, 2, 4, 5, 5

Step 2: Highest number → 5; Lowest number → 1

Step 3: Difference between the highest and the lowest numbers in the list → 5 - 1 = 4. Therefore, the range is 4.

Grades:

Step 1: Let us call the missing number N.

Step 2: We know, Mean = (Sum of all numbers)/(Number of numbers);

Therefore, Sum of all numbers = Mean x Number of numbers

→ 1 + N + 3 + 4 + 5 = 3 x 5 → N + 13 = 15 → N = 15-13 → N = 2

Grades:

Step 1: Sort the list → 1, 1, 2, 5, 5

Step 2: Count of numbers listed → 5 (odd)

Step 3: So the middle number is (count+1)/2 → (5+1)/2 → 3

Grades:

Step 1: Sort the list → 1, 2, 4, 5, 5

Step 2: Find the number that is repeated the most number of times.

Step 3: In the above list, 5 is repeated twice and all the other numbers occur only once. Therefore, the mode is 5.

Grades:

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