Question

Repeated measurements of Pb in a lake
water sample gave 3.2, 5.2 and 7.2 ppb
of Pb. Standard deviation in the
measurement of Pb is
(a) 2ppb
(b) 4ppb
(c) Oppb
(d) 2V2ppb​

Answer 1

Answer:

Repeated measurements of Pb in a lake water sample gave 3.2, 5.2 and 7.2 ppb of Pb . Standard deviation in the measurement of Pb is (a) 2ppb (b) 4ppb (c) Oppb (d) 2V2ppb. 1.