1. Find the median.

Year of experience	Number of employees
1 - 4	16
5 - 8	20
9 - 12	28
13 - 16	24
17 - 20	16
21 - 24	11
25 - 28	5

2. A store carried out sales promotion on a newly arrived T-shirt for 60 days and the number of T-shirts sold as follows. Find the value of p and q.

Number of days of Sales promotion	Frequency	Cummulative Frequency
0n10	210	210
10n20	134	344
20n30	78	q
30n40	p	494
40n60	46	540