Someone help please..
The life expectancy of a typical lightbulb is normally distributed with a mean of 1,975 hours and a standard deviation of 25 hours. What is the probability that a lightbulb will last between 1,950 and 2,050 hours?

0.84

0.77

0.82

0.89

Question

Someone help please..
The life expectancy of a typical lightbulb is normally distributed with a mean of 1,975 hours and a standard deviation of 25 hours. What is the probability that a lightbulb will last between 1,950 and 2,050 hours?

 0.84

 0.77

 0.82

 0.89

anonymous · Answer

Close this question, and I'll give you the answer.

anonymous · Answer

Okay :ooo

anonymous · Answer

0.99865010196837 - 0.158655253931457 = 0.839994848036913

anonymous · Answer

If you round that, it would be .84

anonymous · Answer

Awesome! Mind helping with a few more?

anonymous · Answer

Sure. Post in a new question and tag me.

anonymous · Answer

Aggg thankyou soo much!!