Business, 05.12.2019 04:31 zoet1027

Adesign engineer wants to construct a sample mean chart for controlling the service life of a halogen headlamp his company produces. he knows from numerous previous samples that this service life is normally distributed with a mean of 500 hours and a standard deviation of 20 hours. on three recent production batches, he tested service life on random samples of four headlamps, with these results:

sample service life

1 495 500 505 500

2 525 515 505 515

3 470 480 460 470

what is the sample mean service life for sample 2?

a) 460 hours

b) 495 hours

c) 515 hours

d) 525 hours

Answers: 2

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