The following statistics represent samples of copper wire submitted by two companies for tensile strength testing (psi).

Statistic Company A Company B

Arithmetic Mean 500 600

Median 500 500

Mode 500 300

Standard Deviation 40 20

Mean Absolute Deviation 32 16

Quartile Deviation 25 14

Range 240 120

Sample Size 100 80

The approximate middle 95% of the wires from Company A tested between (________) and (upper) limit. Record ONLY the lower limit as a whole number.

The middle 50 percent of the wires of Company A tested between (_______) and (upper) limits. Record ONLY the lower limit as a whole number.

Which company's distribution has the larger dispersion (answer either 'A' or 'B')?

The variance for Company A is _____?