NCEA Level 3 Statistics | Fun Learning Quest for Kids

A news article claims that '9 out of 10 dentists recommend Brand X toothpaste.' If you assume the true proportion of dentists who recommend Brand X is 0.9, and you randomly survey 20 dentists, what is the probability that exactly 18 recommend Brand X? Use the binomial distribution. Which of the following best describes the approach?

You read a report stating that the number of goals scored in a rugby match follows a Poisson distribution with a mean of 3.5 goals per match. What key assumption about the goals must hold for the Poisson model to be appropriate?

A weather report claims that the daily maximum temperature in Christchurch in January is normally distributed with mean 22°C and standard deviation 3°C. According to the empirical rule, approximately what percentage of January days will have a maximum temperature between 19°C and 25°C?