Answer and workin your attached below. Hope it helps
Answer:
They encircle the planet
times.
Step-by-step explanation:
Consider the provided information.
We have 2.5 mole of dust particles and the Avogadro's number is 
Thus, the number of dust particles is:

Diameter of a dust particles is 10μm and the circumference of earth is 40,076 km.
Convert the measurement in meters.
Diameter: 
If we line up the particles the distance they could cover is:

Circumference in meters:

Therefore,

Hence, they encircle the planet
times.
The median means the number that is in the middle of the spnumber sequence in least to greatest.
1) number the numbers up. 2,2,3,6,7
2) start by crossing off the last from the greatest. Then you can see that 3 is the median.