Question

The following students measure the density of a piece of lead three times. the density of lead is actually 8.9 g/cm3. considering all of the results, which person’s results are both accurate and precise?

a. jenny: 8.55 g/cm3, 8.34 g/cm3, 8.04 g/cm3
c. lila: 8.89 g/cm3, 8.91 g/cm3, 8.92 g/cm3
b. brad: 8.63 g/cm3, 8.64 g/cm3, 8.65 g/cm3
d. none of the above have precise and accurate measurements.

Answer 1

C.  Lila's results are both accurate and precise, since not only are her values precise in accordance with each other, but they are the closest out of all the values to the true density of lead.

Answer 2

c. lila: 8.89 g/cm3, 8.91 g/cm3, 8.92 g/cm3

Step-by-step explanation:

Accurate reading is that reading in which the average value will come closer to the actual given density

so here the closest average value is for reading of Lila

as we know that

`density = (8.89 + 8.91 + 8.92)/(3)`

`density = 8.91 g/cm^3`

also for precise reading we can say that all of them are equally precise because here the reading is calculated by taking 2 digits after decimal

so all readings are equally precise here

so correct answer will be

c. lila: 8.89 g/cm3, 8.91 g/cm3, 8.92 g/cm3