Acertain brand of electric bulbs has an average life of 300 hours with a standard deviation of 45. a random sample of 100 bulbs is tested. what is the probability that the sample mean will be less than 295?

Step-by-step explanation:

Average life of electric bulbs = 300 hrs

standard deviation = 45

Total no of bulbs tested = 100

Probability that sample mean is less than 295 =?

Using Central Limit Theorem

From table of normal distribution:

step-by-step explanation:

is their an equation anywhere i can take a   look at it and see if i am right.