- A45
- B41
- C40
- D47
Step-by-Step Solution
All nine = 360. First five = 190, last five = 215. The fifth reading is counted twice: 190 + 215 - 360 = 45.
Answer: A) 45
Nine rainfall readings have a mean of 40 mm. The first five readings average 38 mm and the last five average 43 mm. What is the fifth reading, in mm?
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