Answer:
66
Step-by-step explanation:
Use the formula for the mean of a set of numbers:
sum of the numbers
average = --------------------------------
count of numbers
Here we know that the average mark was 68, so we can write:
75 + 62 + 84 + 53 + x
average = 68 = ----------------------------------
5
or 274 + x
68 = -------------------
5
Solving for x, we multiply both sides by 5: 340 = 274 + x.
Subtracting 274 from both sides effectively isolates x:
340 = 274 + x
- 274 -274
------------------------
66 = x
The fifth student's mark was 66.
Answer: exact form: 251/56, decimal form 4.482, mixed number form 4 27/56
...more information is clearly needed
Answer: 2.
Step-by-step explanation: This is because 35 is repeating forever.
9.045 is the number added to 0.034 to obtain 9.079
