4/5 are girls. Today 3/5 brought there lunch. What fraction of the students are girls who brought there lunch today?
1 answer:
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Answer:
15
Step-by-step explanation:
The mean is basically the average. To find it, we add up all the numbers and then divide that sum by the number of numbers.
Here, we need to find the sum: 7 + 8 + 9 + ... + 22 + 23. To do so, we can use the formula: , where a_1 is the first number (7 in this case), a_n is the last number (23 in this case), and n is the number of numbers (23 - 7 + 1 = 17 numbers in this case). So:
is the sum.
Now, we need to divide 255 by the number of numbers, which is 17: 255/17 = 15.
Thus, the mean is 15.
Hope this helps!