Question

Q8. a) A company makes electric motors. The probability an electric motor is defective is 0.01. What is the probability that a sample of 300 electric motors will contain (a) no defective (b) at most two defective ?​

Answer 1

Answer:

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Step-by-step explanation:

You need 5 defective motors and 295 working motors so (0.01)5×(0.99)295(0.01)5×(0.99)295

You can have them anywhere in the sample: multiply by (3005)(3005)

p=(3005)×(0.01)5×(0.99)295≈9.3p=(3005)×(0.01)5×(0.99)295≈9.3 %