Question
Acme Corporation manufactures light bulbs. The CEO claims that an average Acme light bulb lasts 300 days. A researcher randomly selects 15 bulbs for testing.
Acme Corporation manufactures light bulbs. The CEO claims that an average Acme light bulb lasts 300 days. A researcher randomly selects 15 bulbs for testing. The sampled bulbs last an average of 290 days, with a standard deviation of 50 days. If the CEO's claim were true, what is the probability that 15 randomly selected bulbs would have an average life of no more than 290 days?
- A. 0.100
- B. 0.226
- C. 0.334
- D. 0.443
- E. 0.775
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Statistics The Exploration & Analysis Of Data
Authors: Roxy Peck, Jay L. Devore
7th Edition
0840058012, 978-0840058010
