Suppose that a customer service center claims that the telephone calls it receives last 114 seconds on average with a standard deviation of 9 seconds.
If you took a sample of 324 telephone calls, which of the following mean
times would be within the 95% confidence interval?

A. 114.5 seconds
B. 117.5 seconds
C. 115.5 seconds
D. 116.5 seconds

x =±sqrt(1/3)

step-by-step explanation:

x+4/6x=1/x

multiply each side by 6x to get rid of the fractions

6x*(x+4/6x)=1/x*6x

distribute

6x^2 +4 = 6

subtract 4 from each side

6x^2 +4-4 = 6-4

6x^2 =2

divide by 6

6x^2/6 = 2/6

x^2 = 1/3

take the square root of each side

sqrt(x^2) = ±sqrt(1/3)

x =±sqrt(1/3)

i can't solve unless i know what the line is

step-by-step explanation:

welcome to/p>

answer: my brother can figure it out, imma go get him so i can answer : ) edit: my brother is sleeping, sorry man

step-by-step explanation: