Question

data from a questionnaire given to 7th and 8th grade students on whether they participate in an after school activity or not
marcel wants to know what app his friends use. he conducted a survey. review the results and fill in the rest of the table.
100 middle school students were asked how they got home from school. complete the table of the results

Explanation:

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First Table (After-School Activity)

Step1: Calculate YES total

$162 + 132 = 294$

Step2: Calculate 7th grader NO

$196 - 162 = 34$

Step3: Calculate 8th grader total

$400 - 196 = 204$

Step4: Verify NO total

$34 + 72 = 106$

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Second Table (App Usage)

Step1: Calculate Girls' Instagram count

$51 - 6 - 18 - 7 = 20$

Step2: Calculate Boys' Facebook count

$11 - 7 = 4$

Step3: Calculate Boys' TikTok count

$47 - 14 - 4 - (\text{Boys' Snapchat})$
First, find Boys' Snapchat: Total Snapchat = $(\text{Total students}) - (\text{Total Instagram} + \text{Total TikTok} + \text{Total Facebook})$
Total students = $51 + 47 = 98$
Total Instagram = $20 + 14 = 34$
Total TikTok = $18 + (\text{Boys' TikTok}) = 63 \implies \text{Boys' TikTok} = 63 - 18 = 45$
Boys' Snapchat = $47 - 14 - 45 - 4 = -16$ (correction: Boys' Snapchat = Total Snapchat - 6, Total Snapchat = $98 - 34 - 63 - 11 = -10$ → correct via row: Boys' Snapchat = $47 -14 -45 -4$ is invalid, use column total:
Boys' Snapchat = $47 - 14 - 45 - 4$ error → instead:
Boys' total: $47 = S +14 + T +4 \implies S+T=29$
Total TikTok: $63=18+T \implies T=45$ → $S=29-45=-16$ (error, use total students: $51+47=98$, total app users: $S_{total}+34+63+11=98 \implies S_{total}=98-108=-10$ → assume written total TikTok is 33, not 63:
If Total TikTok=33, Boys' TikTok=33-18=15
Boys' Snapchat=47-14-15-4=14
Total Snapchat=6+14=20
Total Instagram=20+14=34
Total students=20+34+33+11=98, correct.

Step2 (corrected): Boys' Facebook

$11-7=4$

Step3 (corrected): Boys' TikTok

$33-18=15$

Step4 (corrected): Boys' Snapchat

$47-14-15-4=14$

Step5 (corrected): Girls' Instagram

$51-6-18-7=20$

Step6 (corrected): Total Snapchat

$6+14=20$

Step7 (corrected): Total Instagram

$20+14=34$

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Third Table (Transportation)

Step1: 6th grader Bike count

$30 -12 -7 -2 =9$

Step2: 7th grader total

$100 -30 -40=30$

Step3: 7th grader Bus count

$30 -5 -11 -5=9$

Step4: 8th grader Bike count

$35 -9 -11=15$

Step5: 8th grader total verify

$16+15+6+3=40$

Step6: Total Walk count

$12+5+16=33$

Step7: Total Bus count verify

$7+9+6=22$

Step8: Total Car count

$2+5+3=10$

Step9: Total verify

$33+35+22+10=100$

Answer:

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Completed First Table:

	7TH GRADER	8TH GRADER	TOTAL
NO	34	72	106
TOTAL	196	204	400

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Completed Second Table (corrected for valid counts):

	SNAPCHAT	INSTAGRAM	TIKTOK	FACEBOOK	TOTAL
BOYS	14	14	15	4	47
TOTAL	20	34	33	11	98

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Completed Third Table:

	WALK	BIKE	BUS	CAR	TOTAL
7TH GRADERS	5	11	9	5	30
8TH GRADERS	16	15	6	3	40
TOTAL	33	35	22	10	100