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a microscope has a scale of 250: 1
what does this scale mean?

textbox: everything is 250x larger under the microscope

the width of a grain of sugar is 0.7 millimeter. what will be the width of the grain of sugar in centimeters under magnification?

i have 2.36 but i got it off a bad question on this site so idk if thats right

the diameter of a white blood cell under magnification appears to be 0.3 centimeters. what is the diameter of the white blood cell in millimeters?

i have 3mm but i also got it offa here

(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?