Assume the number of calories in a McDonalds’s Egg McMuffin is a normally distributed random variable with a mean of 295

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Assume the number of calories in a McDonalds’s Egg McMuffin is a
normally distributed random variable with a mean of 295 and σ of 15
calories. What is the probability that a randomly chosen Egg
McMuffin is: a) Less than 300 calories? b) Between 275-301
calories? c) More than 250 calories? d) How many calories are
needed to represent the 75th percentile (round to the nearest
calorie)? e) How many calories are needed for the Egg McMuffin to
have less calories than 90% of all McMuffins (round to the nearest
calorie)? This is a tricky question, so think of what less calories
than 90% of all McMuffins.