genyjoannerubiera
29.04.2021 •
Mathematics
Nathan had an infection, and his doctor wanted him to take penicillin. Because Nathan’s father and paternal grandfather were allergic to penicillin, Nathan had a 75% chance of having the same allergy. The doctor performed a skin test to see whether Nathan would react to it. The test is 98% accurate. What is the probability that Nathan is allergic to penicillin and the test predicts it?
A.
0.005
B.
0.015
C.
0.245
D.
0.735
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Ответ:
10.8109 amu
Step-by-step explanation:
The average atomic mass of boron is determined as the average of the atomic masses of both isotopes weighed by their respective abundances.
Therefore, the average atomic mass is given by:
The average atomic mass of boron isotopes is 10.8109 amu.