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The ozone layer is primarily located in the lower portion of the stratosphere from about 20 to 30 kilometers above Earth, where it absorbs and scatters the solar ultraviolet radiation.
The average of 27 numbers is 20.The average of first 13 numbers is 15 and that of the last 13 numbers is 18. What will be the 27th number?
The average of 10 observations is 60. It was realized later that an observation was misread as 39 in place of 93. The correct average is:
[123 ÷ 8 ÷ 9] × 144 = ? + 12 × 5
