6.5 Nadiya determines that there are no fractions equivalent to To with a denominator greater than 10, but less than 20,
that have a whole number numerator and denominator. Is Nadiya correct?
4
Yes, Nadiya is correct. By multiplying the numerator and denominator by 2, the first fraction equivalent to To is 20
름
Yes, Nadiya is correct. By multiplying the whole fraction by any whole number, each equivalent fraction will
continue to have a denominator of 10.
O No, Nadiya is incorrect. She could multiply both the numerator and denominator of the unit fraction equivalent to
2
10 by 3 and arrive at the equivalent fraction 15
No, Nadiya is incorrect. She could add any number between 1 and 8 to the numerator and denominator and arrive
at an equivalent fraction with a denominator greater than 10 but less than 20.
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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?