To find out how many pounds of a patient's body weight is blood, given that blood accounts for 7% of the total body weight and the patient weighs 150 lb, we follow these steps:
1. Identify the total body weight (W):
[tex]\[
W = 150 \text{ lb}
\][/tex]
2. Identify the percentage of body weight that is blood (P):
[tex]\[
P = 7\% = 0.07
\][/tex]
3. Calculate the weight of blood (B):
To find the weight of the blood, multiply the total body weight by the percentage of body weight that is blood:
[tex]\[
B = W \times P
\][/tex]
Substituting the known values:
[tex]\[
B = 150 \text{ lb} \times 0.07 = 10.5 \text{ lb}
\][/tex]
4. Round the result to the nearest tenth if needed:
The calculation already gives a result of 10.5 lb, which is already rounded to the nearest tenth.
Therefore, the weight of the blood in the patient's body is:
[tex]\[
\boxed{10.5 \text{ lb}}
\][/tex]
Among the given answer options:
a. 11 lb
b. 10.5 lb
c. 21.4 lb
d. None of the above
The correct answer is:
[tex]\[
\boxed{b. \ 10.5 \text{ lb}}
\][/tex]
