Question: Can you pls help me solve this ? 9. The CoHenn Light Bulb Company claims the mean life of a certain type of bulb is

Can you pls help me solve this ?

9. The CoHenn Light Bulb Company claims the mean life of a certain type of bulb is less than 2100 hours with a population standard deviation of 170 hours. A random sample of 30 bulbs has a mean life of 2150 hours. Does the data support the company's claim at a 0.04 level of significance? (life spans of light bulbs is normally distributed) a) H b) C) d)

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