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Task 3: Determine the probability that a random variable (X) having a normal distribution with μ = 20.15 and σ = 6.27 minutes will take on a value less than 9.5.

I've tried this:

Standardised score = (9.6-20.15)/6.27 = -1.698

Now i don't know how to find the pribability of this score on a stats sheet or using my casio classpad. does anyone else know how to do this?

Thank you.