We know the mean is $x. But we don't know how many values are there, what is the range, and how are they spread out.

We also know that average increase is $800. It doesn't say whether 1 employee got a raise of $800*n or everyone got $800 or salaries were distributed in some other format.

1. Knowing the median doesn't help in calculating the median in 2000. The numbers could be distributed in many ways.

eg1:

1999: 47500, 48000, 48,500

2000: 47500, 48000, 50900

Median: 48000

eg2:

1999: 47500, 48000, 48500

2000: 48000, 49000, 49900

Median: 49000

Not sufficient.

2. Knowing the range also doesn't help.

Not sufficient.

Even if we know both. It is not sufficient.

1999: 47000,48000,59000

2000 (1st possibility): 47800, 48800,59800 : Median - 48800

2000 (2nd possibility): 48200, 48000,60200 : Median - 48200

There are thousands of possibilities.

E.

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