Tammy and bob each opened a savings account today. tammy opened her account with a starting amount of $270, and she is going to put in 585 per month.
bob opened his account with no starting amount, and he is going to put in $112 per month.
let x be the number of months after today.
(a) for each account, write an expression for the amount of money in
the account after x months.
amount of money in tammy's account (in dollars) = x= 355
amount of money in bob's account (in dollars) - x = 224
(b) write an equation to show that the two accounts have the same
amount of money,
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(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?