This is a normal distribution question with
a) P(x > 34.0)=?
The z-score at x = 34.0 is,
z = 0.5263
This implies that
P(x > 34.0) = P(z > 0.5263) = 1 - 0.7007
P(x > 34.0) = 0.2993
b) Sample size (n) = 40
Since we know that
P(x > 34.0)=?
The z-score at x = 34.0 is,
z = 3.3289
This implies that
P(x > 34.0) = P(z > 3.3289) = 1 - 0.9996
P(x > 34.0) = 0.0004
PS: you have to refer z score table to find the final
probabilities.
Please hit thumps up if the answer helped you
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