Here are two sets of masses of a sample of two different makes of 400 g chocolate
bars.
Choctastic (g)
391
410
407
402
413
395
Chunky Bar (g)
401
407
405
404
403
404
a Calculate the mean and range of the data for each sample.
b Draw charts to compare the two makes of chocolate.
c Comment on which one you would buy.

The biologist has a second culture to examine. she knows that the population of the culture doubles every 15 minutes. after 1 hour and 15 minutes, her assistant found that 80,000 bacteria were present. a) what was the size of the initial population? b) predict the size of the culture at t=3 hours. what was the size of the population at 40 minutes? explain and justify your answers. c) create a graph of the population as a function of time. find an equation that can be used to predict the size of the population at any time t. d) examine the rate at which the bacteria culture is growing. how fast is the culture growing after 1 hour? after 1.5 hours? after 2 hours? use a time interval of h = 0.01 hours to estimate these rates. interpret these rates in terms of the context of the problem situation. how do these three rates compare?