The accompanying data set contains three numerical variables,x_1,x_2,andx₃.

Click here for the Excel Data File a.How many observations havex₁values greater than 30? b.Sort the data byx₁,x₂,and thenx₃all in ascending order. What are thex₁,x₂,andx₃values of the first observation after the data are sorted? c.Sort the data byx₁andx₂both in descending order. What are thex_1,x₂,andx₃values of the first observation after the data are sorted? d.How many missing values are there inx₁,x₂,andx₃?

Observation	x1	x2	x3
1	33	371	189
2	28	752
3	24	673	204
4	17		151
5	20	66	191
6	15	641	140
7	37	596	187
8	23	442	128
9	23	470	119
10	22	896	148
11	26	657	140
12	39	62	128
13	14	608	108
14	20	84	155
15	24	452	166
16	37	207	213
17	6	999	156
18	17	854	118
19	19	594	158
20	36	842	141
21		850	162
22	16	744	117
23	14	939	134
24	17	695	177
25	16	340	117
26	15	209
27	19	326	139
28	23	558	166
29	23	740	120
30	26	81
31	22	50	142
32	24	720	130
33	14	673	131
34	39	173	160
35	26	507	98
36	43	768	140
37	27	786	166
38	34	677	167
39	31	688	146
40	38	735	143
41	6	992	150
42	24	405	132
43	27	370	101
44	2	46	135
45	25	583	112
46	41	71	94
47	12	748	155
48	11	480	140
49	18	848	171
50	21	180	157
51	36	335	166
52	14		123
53	23	679	138
54	9	165	99
55	28	540	218
56	26	626	95
57	25	620	153
58	18	410	158
59	4	257	144
60	16	552	132
61	12	807	140
62	25	492	156
63	9	845
64	14	259	148
65	25	91	192
66	11	610	201
67	26	922	170
68	12	134	119
69	25	540	114
70	33	218	154
71	19	642	124
72	22	227	130
73	30	987	133
74	8	326	189
75	55	564	178
76	20	37	160
77	14	865	157
78	33	966	163
79	24	203	159
80	13	254
81	8	863	163
82	7	430	160
83	20		140
84	28	510	159
85	14	290	128
86	19	750	169
87	18	412	137
88	28	629	139
89	22	167	125
90	35	842	126
91	38	180	151