Question
Small metal springs are packed in boxes of 100 and $0-5$ per cent of the. total output of springs are delective. Determine the probability that any one box chosen at random shall have:(a) no defective(b) 2 or more defectives.
Step 1
Here, n is the number of springs in a box which is 100 and p is the probability of a spring being defective which is 0.005. So, λ = n*p = 100*0.005 = 0.5. Show more…
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Small metal springs are packed in boxes of 100 and 0:5 per cent of the total output of springs are defective. Determine the probability that any one box chosen at random shall have: (a) no defective (b) 2 or more defectives
Probability
Further problems F.29
Brass terminals are packed in boxes of 200 . If the production ptocess is known to produce $1-5$ per cent defectives on average, determine the probability that a box chosen at random will contain: (a) no defective (b) 1 defective (c) 2 defectives (d) 3 defectives (e) more than 3 defectives.
Further problems
Q. 5 In a certain factory, machines A, B, and C are all producing springs of the same length. Of their, production, machines A, B, and C produce 3%, 1% and 2% defective springs, respectively. Of the total production of springs in the factory, machine A produces 30%, machine B produces 40%, and machine C produces 30%. One spring is selected at random from the total springs produced in a day. If the selected spring is defective, find the probability that it was produced by machines A, B, and C.
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