Nindustry consists of three firms with sales of $360,000, $650,000, and $265,000. a. calculate the herfindahl-hirschman index (hhi)

These three together form total market, so here we have to add up everything to know volume of the market

A+B+C = 1,275,000 is the total market

Then we have to calculate individual market share

which would eb 1) 28.2%, 2) 50.9%, 3) 20.8%

This can be calcualated by simple percetage calculation. ( 1275000-360000/1275000*100)-100 will give what share each has.

Then we apply HHI formula

HHI = s1^2 + s2^2 + s3^2 + ... + sn^2

HHi is nothing but squaring of each of the percentages and adding them up

(28.2)2 +(50.9)2 +(20.8)2

812+2590+432 = 3834

HHI of 3834 shows it is highly competitve market.

13.5%

Explanation:

From this question we have the following information

We have mean return = 10

Standard deviation = 5

We use this formula

Z = x - mean/standard deviation

X is between 15 and 20

15< X< 20

= 15-10/5 < Z < 20-10/5

= 1 < z < 2

Using the Statistical table,

P(z < 2) = 0.9772

P(z< 1) = 0.8413

0.9772 - 0.8413 = 0.1359 x 100

= 13.5%

The probability of JQH stock providing a return within the range 15% to 20% = 13.5%

Thank you