The mileage (km per litre) of 50 cars of the same model was tested by a manufacturer and details are as follows:
FIND MEAN USING STEP DEVIATION METHOD
CI. 10-12. 12-14. 14-16. 16-18
NO. 7. 12. 18. 13
ONLY CORRECT ANSWER GETS 50 POINTS
ALSO ONLY STEP DEVIATION METHOD​
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Answer:
answer is 270
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270 I supposed.
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