A group of three friends cycle from Llanfyllin to Vyrnwy at 12 km/h. They then take the same amount of time to cycle from Vyrnwy
to Bala at 16 km/h.
What is their average speed for the journey from Llanfyllin to Bala?

1. why is a frequency distribution useful? it allows researchers to see the "shape" of the data. it tells researchers how often the mean occurs in a set of data. it can visually identify the mean. it ignores outliers. 2. the is defined by its mean and standard deviation alone. normal distribution frequency distribution median distribution marginal distribution 3. approximately % of the data in a given sample falls within three standard deviations of the mean if it is normally distributed. 95 68 34 99 4. a data set is said to be if the mean of the data is greater than the median of the data. normally distributed frequency distributed right-skewed left-skewed