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The mean and the standard deviation of the 100 observations are found to be 40 and 10 respectively. If at the time of calculation, two observations were taken wrongly as 30 and 70 in the place of 3 and 27 respectively. Determine the accurate standard deviation

Express the following in the form (p/q), where p and q are integers and q ≠ 0.
(i) 0.6(bar) (ii) 0.47(bar) (iii) 0.001(bar)

Express 0.99999 .... in the form (p/q). Are you surprised by your answer? With your
teacher and classmates discuss why the answer makes sense.

Assertion (A): It is easier to obtain a metal from its peroxide rather than sulphides, oxides and carbonates.
Reason (R): Prior to reduction, the metal sulphides and carbonates must be converted into metal peroxides.
(a) Both the Assertion (A) and the Reason (R) are true, and the reason (R) is the correct explanation of the assertion (A).
(b) Both the Assertion (A) and the Reason (R) are true, but the reason (R) is not the correct explanation of the assertion (A).
(c) The assertion (A) is true, but the Reason (R) is false.
(d) Both the Assertion (A) and the Reason (R) are false.

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