The Principal of SACRO Primary is concerned that the average speed of cars travelling along Princess Road exceeds the recommended speed of 60km/h. A random sample of 10 cars had their speeds measured by radar and the results (in km/h) are as follows:
81, 53, 62, 79, 52, 68, 61, 85, 67
Assuming the speed of cars travelling along this road is normally distributed, does this data provide sufficient to support the Principal’s claim at the 5% level of significance?
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