Python Question regarding normal distribution probability

Question

Suppose the annual rainfall, in inches, in some region is normally distributed with μ=10 and σ=5. What is the probability that it takes (strictly) more than 10 years before a year with 20 inches of rain occurs (assuming each year's rainfall is independent)?

To specify a different mean, μ, and standard deviation, σ, use the loc and scale keywords like so: norm.cdf(a, loc = mu, scale = sigma)

Use norm.cdf as appropriate and, once again, assign your answer to the variable ans. Do NOT round your answer.

Only use norm.cdf and no other imports. The 3rd and 4th decimal places for the answer equal 44.

Answer 1

from scipy.stats import norm

mu=10

sigma=5

#the cdf is the prob that it rains less than (first parameter, in this case 20) inches in a year

norm.cdf(20, loc = mu, scale = sigma)

#thus the prob that it takes more than 10 years to rain 20 inches

#is the same as saying it goes without raining 20 inches for 10 years

#so we multiply the prob of each year not raining 20 inches together 10 times

ans=norm.cdf(20, loc = mu, scale = sigma)**10

print(ans)