Stats- Hypothesis Test

Gentle Ben is a Morgan horse at a Colorado dude ranch.  Over the past 8 weeks, a veterinarian took glucose readings and found a sample mean of X = 93.8. Let x be a random variable representing glucose readings taken from Gentle Ben.  We may assume that x has a normal distribution, and we know from past experience that σ = 12.5.  The mean glucose for horses should be µ = 85 mg/100ml.  Doe these data indicate that Gentle Ben has an overall average glucose level higher than 85.  Use a 0.05 level of significance.