Question

11 what percentage of the days that it rained, did they forecast no rain?

	forecast rain	forecast no rain
does not rain	2	7	9
	20	10	30

options:
a about 20%
b about 14%
c about 12%
d about 18%

Explanation:

Step1: Identify relevant values

From the table, the number of days it rained and forecast no rain is 3, and the total number of days it rained is 21.

Step2: Calculate the percentage

The formula for percentage is $\frac{\text{Number of days rained and forecast no rain}}{\text{Total number of days it rained}} \times 100\%$. Substituting the values, we get $\frac{3}{21} \times 100\%$.

Step3: Simplify the fraction

$\frac{3}{21} = \frac{1}{7} \approx 0.1429$. Then, $0.1429 \times 100\% \approx 14\%$.

Answer:

B. About 14%