Suppose Apple claims that the average wait time for a customer calling the Apple Care support line is 175 sec-onds. A random sample of 40 customers had an average wait time of 187 seconds. Assume the population standard deviation for wait time is 50 seconds. Using a 95% confidence interval, does this sample support Apple?

yes

95% confidence intervals for the apple care support

(171.505 ,202.495)

Step-by-step explanation:

Step(i):-

Given Mean of the Population = 175 seconds

Random sample size 'n' =40

Mean of the sample = 187 seconds

Standard deviation of the Population = 50 seconds

Step(ii):-

95% confidence intervals for the mean is determined by

(187 -15.495 , 187 +15.495)

(171.505 ,202.495)

Final answer:-

95% confidence intervals for the apple care support

(171.505 ,202.495)

560

step-by-step explanation:

giggidy

x = 2

step-by-step explanation:

if sr parallel to ba then the sides bc and ac are in proportion, that is

= ← substitute values

= ( cross- multiply )

27x = 6(4x + 1)

27x = 24x + 6 ( subtract 24x from both sides )

3x = 6 ( divide both sides by 3 )

x = 2