) A watershed experiences a rainfall of 8 inches. What is the runoff volume when the curve number is 80

5.625 inches

Step-by-step explanation:

Given that:

Total Rainfall in inches (P) = 8 inches

The runoff volume (in inches) Q = ???

The curve number CN = 80

Recall that: The runoff volume can be calculated by using the formula:

   for P > 0.2S

Q = 0                     for P < 0.2S

where:

curve number CN = 80

S = 2.5 inches

Since the rainfall (P) is greater than 0.25

Then:

Q = 5.625 inches

Thus, the runoff volume = 5.625 inches

d

step-by-step explanation:

hello,

b) 62.47% of the students are between 14 and 18 years old.

step-by-step explanation:

mean = 15 and standard deviation = 2

student between 14 to 18

formula used z-score

for age 14 , z score

using z-table , p(z> -0.5)=0.3085

for age 18 , z score

using z-table , p(z< 1.5)=0.9332

p(-0.5< z< 1.5)=0.9332-0.3085 = 0.6247

thus, 62.47% of the students are between 14 and 18 years old.

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