In a certain city, the monthly electricity bills for the month of April followed a normal distribution with a mean of $65.43 and a standard deviation of $9.22. The number of households in the city is 261,500.
Rounded to the nearest hundred, what is the expected number of households that paid between $50 and $70?
A)
91,100
B)
130,600
C)
168,100
D)
248,200

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:

step-by-step explanation:

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