The mean life of a particular brand of light bulb is 1200 hours and the standard deviation is 75 hours. Tests show that the life of the bulb is approximately normally distributed. It can be concluded that approximately 68% of the bulbs will last between:

It can be concluded that approximately 68% of the bulbs will last between:1125 and 1275 hours

Step-by-step explanation:

For this case we know that the random variable X "iife of a particular brand of light bulb " and we know the following distribution:

And we can use the empirical rule for this case and we know that 68% of the values are within one deviation from the mean and we can find the limits like this:

It can be concluded that approximately 68% of the bulbs will last between:1125 and 1275 hours

answer: there are x+184 pages in olivia's book.

step-by-step explanation:

let the total number of pages in the book which olive has already read be x.

then if olive has 184 pages left to read, then the total number of pages are in olive's book= pages she has read+pages she has left to read

therefore, the total number of pages in olivia's book=

hence, there are x+184 pages in olivia's book.