# similarities and differences?

1.Describe the similarities and differences between the graphs of two normally distributed sets of data:

• Data Set A: a data set with a mean of 15 and a standard deviation of 5

• Data Set B: a data set with a mean of 15 and a standard deviation of 1

2.A company determines that the life span of one of its car engines is normally distributed with a mean of 150 000 km and a standard deviation of 10 000 km. For how many kilometres should the company warranty the car engine so that the company will only have to replace fewer than 2.5% of the engines?

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