I would like some assistance with the following probability distrution and inference for mean and population exercise

I would like detailed explanation as well

6.In Jamaica, the Covid-19 virus vaccine has finally arrived. We wish to estimate the mean number of vaccines that are administered daily to healthcare and essential workers registered at a facility. It is known that the variance is 900. How many health facilities should be used so that the estimate will be within 10 of the population mean with a 99% confidence interval? A-60 B-15 C-35 D-71 E-25I". Scientists are testing out the effects of a new drug. They place 15 rats in a contained space and administer a low dose of the drug to each rat. The dosage given to the rats was then increased weekly to evaluate the effects of higher dosage on patients. Using the scenario above, what type of study would this be an example of? AAnecdotal Evidence 3 Experimental Study CCensus D-Observational Study EOvert Study 8. The Mona School of Business and Management would like to know the preferred mode of delivery for Fall 2022f2023. They obtain a list of all 3000 students and selected 100 from the list. What type of sampling method is being used? ASimple Random Sample 8 Voluntary Response [2 Multistage Random Sample D-Stratied random sample E-Cluster Sample 9. The names of 200 students across Kingston who entered an essay writing competition have been collected and stored by the competition's host. What level of measurement best describes this scenario? ANominal B-lnterval CRatio D-Clrdinal 10. A telecommunications compamr believes that 7'19'6 of the residents in Mocho Town own a cell phone. A marketing manager disagrees with this claim. He surveys 200 residents and finds that 140 of them own cellphones. What is the value for the test statistics? A-D.1252 30.2355 C0.3165 DO.2165