A Bangladeshi vaccine against Covid-19 demonstrated a vaccine efficacy of 50.0% .It means that vaccinated people have a 50.0% 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 who'll be at a lower risk ? Answer in exact fraction, or rounded to at least 2 decimal places.

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