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...work and what makes it beat? Your heart is a fascinating muscle: It keeps contracting regularly throughout your lifetime, on average 2 billion times, without a rest. This organ ensures that blood is pumped efficiently through the body to provide it with oxygen, whilst removing waste products. To do this, two circular routes of blood flow start from the heart: blood with a...

...work out how many occurrences we should expect of things happening. For example, you saw in Figure 4 the density at 14°C temperature was approximately 0.18. But because there was one measurement per day in the data set, the distribution is made up of 365 measurements. So, The number of times we expect to get a temperature of 14°C = number of measurements* probability...