20% of the readings obtained by a voltmeter used in a laboratory are inaccurate. If 10 readings are taken at random, using the voltmeter, find the probability that (i) Exactly 2 readings will be inaccurate. (ii) Not more than 2 readings will be inaccurate. (iii) At least 9 readings will be inaccurate. (iv) If 20 students take 10 readings each, how many of them are likely to get less than 3 in accurate readings.
use probability distribution method
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obtained by a voltmeter used in a laboratory are inaccurate. If 10 readings are taken at random, using the voltmeter, find the probability that (i) Exactly 2 readings will be inaccurate. (ii) Not more than 2 readings will be inaccurate. (iii) At least 9 readings will be inaccurate. (iv) If 20 students take
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