What percentage of resistors will go to scrap

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(a) A certain machine makes electrical resistors having a mean resistance of 40 ohm ant a standard deviation of 4 ohms. Assuming that the resistance follows a norma distribution and can be measured to any degree of accuracy, the resistors are acceptablt only if fallow the speci?cation which is 30 ohm to 50 ohm.

(i) What percentage of resistors will go to scrap?

(ii) Find the probability that a resister has more than 50 ohm resistance.

(b) The IQs of 600 applicants to a certain college are approximately normally distributec with a mean of 115 and a standard deviation of 12.

(i) If the college requires an IQ of at least 95, how many of these students will be rej ecter on this basis of IQ, regardless of their other quali?cations?

(ii) If 83% of the candidate are rejected what is the minimum score for selection criteria.

Reference no: EM132844955

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