Amanufacturer knows that their items have a normal distribution lifespan with a mean of 11. nine years in a standard deviation of 3.9 years. if 4 items are picked at random, 1% of the time their mean life will be less than how many years?

addition

step-by-step explanation:

answer: solve 5\cdot 2^x=2405⋅2  

x

=2405, dot, 2, start superscript, x, end superscript, equals, 240.

solution

to solve for xxx, we must first isolate the exponential part. to do this, divide both sides by 555 as shown below. we do not multiply the 555 and the 222 as this goes against the order of operations!

\begin{aligned} 5\cdot 2^x& =240 2^x& =48 \\ \end{aligned}  

5⋅2  

x

2  

x

​    

=240

=48

​

step-by-step explanation:

hey there : ) your answer would be a.

step-by-step explanation: