Percentage of the students will have a grade point average of 3.5 or better

The grade point average of students at a university is normally distributed, with a mean of 2.6 and a standard deviation of 0.6. A recruiter for a company is interviewing students for summer employment. What percentage of the students will have a grade point average of 3.5 or better?

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...tandard deviation = (3.5 - 2.6)/0.6 = 0.9/0.6 = 1.5

P(x >=3.5) = P(z > = 1.5) = ...