A Manufacturer of Bike Racks for Cars Claims That the Assembly

A manufacturer of bike racks for cars claims that the assembly time x for a particular model is normally distributed with a mean of 1 hour and a standard deviation of 0.10 hours.
Find the probability that it takes at most 1.1 hours to assemble a bike rack of this model.
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Find the probability that it takes longer than 1.2 hours to assemble a bike rack of this model.
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Find the probability that it takes between 0.8 hours and 1.1 hours to assemble a bike rack of this model.
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Find the assembly time that exceeds 97.5% of all other assembly times for bike racks of this model.
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