Construct a relative frequency histogram for NAB and a frequency polygon for WBK on the same graph with equal class widths, the first class being "$16 to less than $17". Use two different colours for NAB and WBK. Graph must be done in EXCEL or similar software.

observation NO:	period	WBK Opening price	observation NO:	period	NAB Opening price
1	januray-2012	19.86	1	januray-2012	22.22
2	Apr-12	21.94	2	Apr-12	23.54
3	Jul-12	21.27	3	Jul-12	22.55
4	Oct-12	24.71	4	Oct-12	24.26
5	januray-2013	25.86	5	januray-2013	23.78
6	Apr-13	30.55	6	Apr-13	29.34
7	Jul-13	28.51	7	Jul-13	27.95
8	Oct-13	32.67	8	Oct-13	32.72
9	januray-2014	32.16	9	januray-2014	33.13
10	Apr-14	34.32	10	Apr-14	33.72
11	Jul-14	33.65	11	Jul-14	31.21
12	Oct-14	31.42	12	Oct-14	30.57
13	januray-2015	32.94	13	januray-2015	31.96
14	Apr-15	38.85	14	Apr-15	36.55
15	Jul-15	32.04	15	Jul-15	32.28
16	Oct-15	29.79	16	Oct-15	28.98
17	januray-2016	33.56	17	januray-2016	29.14
18	Apr-16	29.85	18	Apr-16	25.9
19	Jul-16	29.41	19	Jul-16	25.63
20	Oct-16	29.78	20	Oct-16	28
21	januray-2017	32.6	21	januray-2017	30.67
22	Apr-17	35	22	Apr-17	33.17
23	Jul-17	30.56	23	Jul-17	29.61
24	Oct-17	32.13	24	Oct-17	31.54
25	januray-2018	31.35	25	januray-2018	29.57
26	Apr-18	28.62	26	Apr-18	29.57
27	Jul-18	29.3	27	Jul-18	27.49
28	Oct-18	27.6	28	Oct-18	27.71
29	januray-2019	25.04	29	januray-2019	24.07
30	Apr-19	26.18	30	Apr-19	25.4
31	Jul-19	28.46	31	Jul-19	26.9
32	Oct-19	29.62	32	Oct-19	29.59
33	januray-2020	24.23	33	januray-2020	24.63
34	Apr-20	17.08	34	Apr-20	17.17
35	Jul-20	18.17	35	Jul-20	18.34
36	Oct-20	16.9	36	Oct-20	17.8
37	januray-2021	19.37	37	januray-2021	22.6
38	Apr-21	24.42	38	Apr-21	25.97
39	Jul-21	25.94	39	Jul-21	26.35
40	Oct-21	25.61	40	Oct-21	27.38