If turning up 1 or 3 is considered a success , then the S.D of number of successes in 8 throws isA. `(16)/(9)`B. `(8)/(3)`C. `(4)/(3)`D. `(2)/(3)`

If turning up 1 or 3 is considered a success , then the S.D of number

1.	If turning up 1 or 3 is considered a success , then the S.D of number of successes in 8 throws isA. `(16)/(9)`B. `(8)/(3)`C. `(4)/(3)`D. `(2)/(3)`
Answer» Correct Answer - C

Five coins are tossed simultaneously. The probability that at least on head turning up, isA. `(1)/(32)`B. `(5)/(32)`C. `(7)/(16)`D. `(31)/(32)`
If the chance of a gushot hitting a target is 0.2 then the probability that at least 2 shots out of 10 will hit the target isA. `1-((4)/(5))^(10)`B. `1-7((4)/(5))^(10)`C. `1+(7)/(2) ((4)/(5))^(10)`D. none of these
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Workers in an industry have a 10% chance of sufering from an occupational disease ,Probability that , out of 6 workers , at least 5 will catch the discease isA. `(11)/(2,00,000)`B. `(11)/( 2,000)`C. `(11) /( 200)`D. none of these
If a coin is tossed 6 times , then probability of getting 4 or more haeads isA. `(10)/(32)`B. `(11)/(32)`C. `(12)/(32)`D. `(13)/(32)`
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