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The mean grade of 10 students was 72.if 2 of the students with grades of 53,75 are cancelled. What should be the mean grade of the remaining?

A box contains 12 bulbs with 3 defective ones. If two bulbs are drawn from the box together.what is the probability that a)both bulbs are defetive b)both are non defective c)one bulb is defective?

The simplified form of the complex no. (1-i/2 2i) (1/-2-2i) is.....?

if air contains78% of nitrogen by volume what is the solubility nitrogen in water at 25 degree celcius?