Find the mean of the data summarized in the given frequency distribution. 1) The manager of a bank recorded the amount of time each customer spent waiting in line during pea 1)
business hours one Monday. The frequency distribution below summarizes the results. Find the me
waiting time. Round your answer to one decimal place.
Waiting time Number of
(minutes) customers
0-3
9
4-7
11
8 - 11
13
12 - 15
5
16 - 19
7
20-23
3
24 - 27
1
A) 9.9 min
B) 7.0 min
C) 13.5 min
D) 9.7 min

Asurvey of 2,000 doctors showed that an average of 3 out of 5 doctors use brand x aspirin.how many doctors use brand x aspirin

Aline passes through the point (–7, 5) and has a slope of 1/2 which is another point that the line passes through?

(20 points) a bank has been receiving complaints from real estate agents that their customers have been waiting too long for mortgage confirmations. the bank prides itself on its mortgage application process and decides to investigate the claims. the bank manager takes a random sample of 20 customers whose mortgage applications have been processed in the last 6 months and finds the following wait times (in days): 5, 7, 22, 4, 12, 9, 9, 14, 3, 6, 5, 15, 10, 17, 12, 10, 9, 4, 10, 13 assume that the random variable x measures the number of days a customer waits for mortgage processing at this bank, and assume that x is normally distributed. 2a. find the sample mean of this data (x ě…). 2b. find the sample variance of x. find the variance of x ě…. for (c), (d), and (e), use the appropriate t-distribution 2c. find the 90% confidence interval for the population mean (îľ). 2d. test the hypothesis that îľ is equal to 7 at the 95% confidence level. (should you do a one-tailed or two-tailed test here? ) 2e. what is the approximate p-value of this hypothesis?