A school is considering buying a large number of safety devices to install in the classrooms. The devices are designed to activate sprinklers if the temperature in the room exceeds 65°C. A sample of the devices are tested by slowly increasing the temperature and noting the temperatures. in °C. at which the sprinklers are activated. The results are as follows.

Use a t-test and the 10% significance level to examine whether the mean temperature at which the sprinklers are activated is 65 °C. Assume that the sample is random and mean temperatures are normally distributed.

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57.8 62.9 63.7 71.2 60.6 69.5 64.7 65.7