Question

3. A group consists of 7 men and some women. The probability of
selecting 2 women from them is is. Find the number of women in
the group​

Answer 1

Step-by-step explanation:

Depletion of oxygen=5ppm

Solution of sewage=2%

Consider,

Total quantity of sewage= 100%

We have,

BOD = (DO initial -DO final) * Dilution factor.

Dilution factor =(Vol of diluted sample/Vol of in diluted sewage sample).

DO initial-DO final means depleted oxygen content.

Therefore,

BOD = 5 * (100/2) = 250ppm.