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1. A student’s marks in the recitation, exam and project in a biology class were 80, 83 and 86
respectively. If the weights accorded these marks were 1, 2 and 3 respectively, what is the
weighted mean of the student?
2. A man drive to his workplace at 30 kph. On the way home he traveled at 50 kph. What is his
average speed?
3. Is the geometric mean of the first 100 natural numbers greater, equal or less than 50?
4. What is the variance of 1, 3, 5, and 7?
5. What is the mean absolute deviation of 1, 5, 8, & 10?
6. What is the standard deviation of 10, 20, & 30
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