id	age	sex	status	verbiq	perfiq	fulliq	iqtype	totyrs	hyperact	tapping	group
101	11.08333	M	77	61	85	70	WISC	11	NA	72	lead < 40
102	9.416667	M	77	82	90	85	WISC	6	0	61	lead < 40
103	11.08333	M	30	70	107	86	WISC	5	NA	49	lead < 40
104	6.916667	M	77	72	85	76	WISC	5	2	48	lead < 40
105	11.25	M	62	72	100	84	WISC	11	NA	51	lead < 40
106	6.5	M	72	95	97	96	WISC	6	0	49	lead < 40
107	6.916667	M	54	89	101	94	WISC	6	0	50	lead < 40
108	15	F	73	57	64	56	WISC	15	NA	58	lead < 40
109	7.166667	F	22	116	111	115	WISC	7	0	50	lead < 40
110	7.25	M	77	95	100	97	WISC	7	0	51	lead < 40
111	13.66667	F	63	82	76	77	WISC	12	NA	59	lead < 40
112	10.33333	F	48	116	136	128	WISC	10	1	65	lead < 40
113	12.58333	M	48	99	100	99	WISC	12	NA	57	lead < 40
114	12.08333	M	48	74	90	80	WISC	12	NA	53	lead < 40
115	15	M	48	100	135	118	WISC	10	NA	74	lead < 40
116	10.58333	M	48	72	104	86	WISC	10	2	50	lead < 40
117	15.91667	M	48	126	149	141	WISC	15	NA	84	lead < 40
118	9.666667	F	63	80	99	88	WISC	9	0	46	lead < 40
119	8	M	63	86	107	96	WISC	8	1	52	lead < 40
120	11.08333	M	63	94	99	96	WISC	11	NA	64	lead < 40
121	7.75	M	55	100	113	107	WISC	7	0	59	lead < 40
122	11.33333	F	63	72	104	86	WISC	10	NA	55	lead < 40
123	6.666667	M	70	63	101	80	WISC	5	1	NA	lead < 40
124	6.083333	M	70	101	111	107	WISC	2	1	46	lead < 40
125	9.416667	M	63	85	118	101	WISC	2	0	52	lead < 40
126	13.5	F	77	85	99	91	WISC	2	NA	63	lead < 40
127	9.583333	F	44	124	122	125	WISC	9	0	52	lead < 40
128	6.166667	M	41	105	87	96	WISC	1	0	42	lead < 40
129	13.33333	M	41	81	118	99	WISC	1	NA	57	lead < 40
130	6.583333	M	77	87	113	99	WISC	5	2	23	lead < 40
131	12.75	F	77	100	128	115	WISC	5	NA	65	lead < 40
132	8.166667	F	77	91	121	106	WISC	5	1	38	lead < 40
133	9.916667	M	70	99	111	105	WISC	6	0	59	lead < 40
134	7.333333	F	58	89	104	96	WISC	6	0	26	lead < 40
135	12.83333	M	91	57	51	50	WISC	12	NA	53	lead < 40
136	6.333333	F	91	99	100	99	WISC	6	0	50	lead < 40
137	9.333333	F	77	58	113	85	WISC	2	0	56	lead < 40
138	14.25	F	77	97	82	88	WISC	11	NA	49	lead < 40
139	15.41667	M	70	94	146	120	WISC	9	NA	76	lead < 40
140	14.08333	M	70	82	107	93	WISC	9	NA	68	lead < 40
141	9.833333	F	77	92	83	87	WISC	10	1	60	lead < 40
142	7.083333	F	77	89	108	98	WISC	6	1	46	lead < 40
143	12.83333	F	77	69	93	78	WISC	3	NA	57	lead < 40
144	8.083333	M	77	87	114	100	WISC	3	1	45	lead < 40
145	7.25	M	77	97	113	105	WISC	5	0	46	lead < 40
146	15.41667	F	58	82	94	87	WISC	15	NA	64	lead < 40
147	6.916667	F	58	85	106	94	WISC	6	1	40	lead < 40
148	14.25	F	63	89	92	89	WISC	14	NA	62	lead < 40
149	7.333333	M	91	85	79	80	WISC	6	1	13	lead < 40
150	13.33333	M	77	92	129	111	WISC	5	NA	79	lead < 40
151	12.08333	M	77	95	114	104	WISC	5	NA	61	lead < 40
152	6.166667	M	70	76	99	85	WISC	3	1	46	lead < 40
153	7.166667	M	70	80	110	94	WISC	3	0	50	lead < 40
154	9.583333	M	70	66	90	75	WISC	8	1	48	lead < 40
155	12.83333	F	70	67	85	73	WISC	8	NA	65	lead < 40
156	15.25	M	70	63	94	76	WISC	8	NA	62	lead < 40
157	10.58333	M	77	87	127	107	WISC	7	0	56	lead < 40
158	9.75	M	73	79	101	88	WISC	2	1	54	lead < 40
159	13.91667	F	44	82	99	89	WISC	6	NA	72	lead < 40
160	12.5	F	44	82	113	96	WISC	6	NA	57	lead < 40
161	6.333333	F	66	70	80	72	WISC	6	0	50	lead < 40
162	11.83333	F	66	81	115	97	WISC	8	NA	65	lead < 40
163	15	F	73	72	85	76	WISC	15	NA	56	lead < 40
201	10.08333	M	79	75	93	82	WISC	10	2	54	lead >= 40
202	10.41667	F	79	87	100	93	WISC	11	0	57	lead >= 40
203	9.916667	M	77	76	97	85	WISC	9	1	48	lead >= 40
204	6.833333	M	77	76	79	75	WISC	6	1	41	lead >= 40
205	5.083333	M	63	76	97	85	WISC	4	0	34	lead >= 40
206	12.75	F	62	92	71	80	WISC	12	NA	54	lead >= 40
207	6.166667	M	41	91	111	101	WISC	6	0	38	lead >= 40
208	7.416667	F	41	82	99	89	WISC	7	0	49	lead >= 40
209	12	F	52	80	85	80	WISC	6	NA	58	lead >= 40
210	8.583333	M	52	91	99	94	WISC	6	2	14	lead >= 40
211	6.75	M	77	81	97	88	WISC	5	1	40	lead >= 40
212	6.916667	M	52	97	111	104	WISC	6	0	13	lead >= 40
213	8.166667	M	70	76	104	88	WISC	7	0	51	lead >= 40
214	11.25	F	70	85	93	88	WISC	10	NA	44	lead >= 40
215	13.58333	M	70	116	104	112	WISC	12	NA	52	lead >= 40
216	9.5	M	70	80	90	83	WISC	8	3	42	lead >= 40
217	8.75	M	77	100	107	104	WISC	8	0	55	lead >= 40
218	6.5	M	44	94	108	101	WISC	6	1	44	lead >= 40
219	15	F	44	81	106	92	WISC	8	NA	48	lead >= 40
301	14	M	58	72	78	72	WISC	14	NA	62	lead >= 40
302	7	F	73	85	97	90	WISC	7	1	37	lead >= 40
303	7.5	M	91	80	107	92	WISC	5	1	46	lead >= 40
304	13.33333	F	79	67	80	71	WISC	12	NA	59	lead >= 40
305	6.166667	M	77	85	90	86	WISC	6	0	35	lead >= 40
306	15.25	M	77	79	83	79	WISC	15	NA	70	lead >= 40
307	12.08333	M	91	70	101	83	WISC	12	NA	56	lead >= 40
308	9.583333	M	77	105	121	114	WISC	5	0	45	lead >= 40
309	9.083333	F	58	92	108	100	WISC	9	0	50	lead >= 40
310	8.166667	M	70	89	100	93	WISC	8	0	52	lead >= 40
311	14	F	51	74	110	91	WISC	1	NA	52	lead >= 40
312	9.333333	M	70	86	111	98	WISC	3	0	83	lead >= 40
313	11.16667	F	73	87	97	91	WISC	11	NA	57	lead >= 40
314	7.166667	M	70	51	51	46	WISC	6	1	38	lead >= 40
315	9.5	F	48	80	94	85	WISC	9	1	40	lead >= 40
401	4.333333	M	48	101	112	107	WPPSI	3	1	NA	lead < 40
402	4.833333	F	66	95	112	104	WPPSI	4	1	NA	lead < 40
403	3.916667	M	63	81	92	85	WPPSI	3	0	NA	lead < 40
404	4.583333	M	70	61	97	76	WPPSI	4	1	NA	lead < 40
405	4.5	M	77	94	97	95	WPPSI	4	0	NA	lead < 40
406	3.75	M	29	85	91	86	WPPSI	4	3	NA	lead < 40
407	4.25	M	62	76	105	89	WPPSI	4	3	NA	lead < 40
408	4.333333	M	62	72	84	76	WPPSI	4	1	NA	lead < 40
409	4.333333	F	91	97	95	96	WPPSI	4	0	NA	lead < 40
410	5.583333	M	73	95	108	101	WPPSI	3	1	48	lead < 40
411	4.333333	F	66	97	118	108	WPPSI	4	0	NA	lead < 40
412	4.75	F	77	87	118	102	WPPSI	4	0	NA	lead < 40
413	5.416667	F	91	74	86	77	WPPSI	5	1	NA	lead < 40
414	4.5	M	91	66	89	74	WPPSI	4	1	NA	lead < 40
415	6.5	F	91	86	100	92	WPPSI	6	0	50	lead < 40
501	4.166667	M	79	86	108	96	WPPSI	4	2	NA	lead >= 40
502	4.583333	M	58	79	78	76	WPPSI	4	0	NA	lead >= 40
503	4	M	41	70	95	80	WPPSI	4	2	NA	lead >= 40
504	3.75	M	58	84	78	79	WPPSI	3	1	NA	lead >= 40
505	3.75	F	91	69	86	75	WPPSI	3	0	NA	lead >= 40
601	4.333333	M	77	87	80	82	WPPSI	4	2	NA	lead >= 40
602	3.75	F	77	94	101	97	WPPSI	3	1	NA	lead >= 40
603	5.583333	F	58	91	92	91	WPPSI	5	1	NA	lead >= 40
604	4.583333	M	77	92	100	92	WPPSI	3	1	NA	lead >= 40
605	5.166667	F	58	81	77	77	WPPSI	5	1	42	lead >= 40
606	3.833333	M	70	111	108	111	WPPSI	3	0	NA	lead >= 40
607	3.916667	M	73	75	85	78	WPPSI	4	1	NA	lead >= 40

table: lead.csv

1. Use R to determine how many subjects there are, that is, how many different subject ids.

2. Using R commands, display the record (row of the data frame) for subject id 202.

3. Find the median, 25th and 75th percentiles, and interquartile range for the ages of the subjects in the study.