Question

In 1976, the average blood lead level was about _ ug/dL.
The amount of lead used in a 6-month period in 1978
was about _ 10^3 tons.

Answer 1

Answer:

n the United States, average BLLs measured among tens of thousands of subjects declined from 12.8 to 2.8 μg/dL between 1976 and 1991.

Explanation:

Answer 2

The average blood lead level in 1976 and tbe amount of lead used in a 6 month period in 1978 are 15.2 ug/dL and 76×10³ metric tonnes respectively.

• From the graph attached, the average blood level is marked as black and represented to the left on the y-axis

• The amount of lead used in a 6-month period is marked as white as represented to the right on the y - axis.

• The years are represented on the x - axis of the graph.

Therefore, using the graph, the average blood level in 1976 and amount of lead used in 1978 are about 15.2 and 76×10³ respectively.

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