Problem 2 A Bangladeshi vaccine against Covid-19 demonstrated a vaccine efficacy of 40.0% .lt means that vaccinated people have a 40.0% lower risk of getting COVID-19 compared to others who weren't...

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Extracted text: Problem 2 A Bangladeshi vaccine against Covid-19 demonstrated a vaccine efficacy of 40.0% .lt means that vaccinated people have a 40.0% lower risk of getting COVID-19 compared to others who weren't vaccinated. Suppose 19 human volunteers from Noakhali were randomly selected for clinical trials. a. What is the mean number of volunteers whoʻll be at a lower risk ? Answer in exact fraction, or rounded to at least 2 decimal places. b. What is the standard deviation in the number of volunteers at a lower risk of getting COVID-19? Answer in exact fraction, or rounded to at least 2 decimal places. Rectangular Snip c. What is the probability that the number of volunteers with a lower risk is more than 2 standard deviations away from the mean value? Answer in exact fraction, or rounded to at least 4 decimal places.