. A discount brokerage selected a random sample of 64 customers and reviewed the value of their accounts. The mean was $32,000 with a population standard deviation of $8,200. What is a 90% confidence interval for the mean account value of the population of customers

The  90% confidence interval is  

Step-by-step explanation:

From the question we are told that

   The  sample size is  n =  64

     The sample  mean is  

     The  standard deviation is  

Given that the confidence interval is  90% then the level of significance is mathematically evaluated as

Next we obtain the critical value of   from the normal distribution table , the value is  

  Generally the margin of error is mathematically represented as

  =>  

  =>  

The 90% confidence interval is mathematically represented as

 =>    

=>    

the bottom of the spinner is not flat.

step-by-step explanation: