To calculate the mean, you add up all the scores and divide by the total number of scores:
43% + 44% + 75% + 21% + 98% + 86% + 71% + 76% + 63% + 55% = 692%
692% / 10 = 69.2%
So, the mean mark is 69.2%.
To find the number of students who scored below the mean mark, you need to count how many scores are below 69.2%. From the given scores, there are 3 scores below 69.2% (43%, 44%, and 21%).
Therefore, 3 students scored below the mean mark.
To find the median, you need to arrange the scores in numerical order:
21%, 43%, 44%, 55%, 63%, 71%, 75%, 76%, 86%, 98%
The median is the middle value in the list. Since there is an even number of scores, you find the average of the two middle values:
The middle two values are 63% and 71%.
(63% + 71%) / 2 = 67%
So, the median mark is 67%.
The results of a class test are as follows.
43% 44% 75% 21% 98% 86% 71% 76% 63% 55%
4.1 Calculate the mean.
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4.2 How many students scored below the mean mark?
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4.3 Find the median.
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1 answer