Calculate the following -1/6(-2/3)-1/3. the answer is 3/20

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Here

-1/6 × - 2/3× - 1/3
= - 1/27

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-1/6(-2/3)-1/3
-1/3(-1/3)-1/3
-1/3(-1-1/3)
-1/3(-2/3)
2/9 hope this help

The pitch the smallest value of length can be read directly from a main scale accurately. & it is measured as pitch = unit of main scale/no. of divisions in the unit for example if the unit of the main scale is centimeters & the number of division is 10 then pitch 0.1

least count is the magnitude of the smallest measurement that can be measured by an instrument accurately.

l.c. = pitch/no. of divisions in the vernier scale

Mean = sum of the all observation / total no. of observation

mean= 18+15+22+18+25+19+23/7
= 140/7
=20