Mean=121

Standard Deviation=9

Find P (x>1103)

97.5%

0.5%

68%

95%

97.5%

Step-by-step explanation:

Find the z-score.

z = (x - μ) / σ

z = (103 - 121) / 9

z = - 2

We can use a table or calculator to find the probability:

P (Z > - 2) = 0.975

Alternatively, we can use the Empirical rule. 95% of the normal distribution is between - 2 and + 2 standard deviations. Since a normal distribution is symmetrical, 47.5% is between - 2 and 0. 50% is greater than 0. So the percent greater than - 2 is 47.5% + 50% = 97.5%.