Praxis 5511 Practice Question
Survey: 34 took calculus, 19 statistics, 3 both, 11 neither. Total surveyed?
Correct Answer: C
Rationale: To determine the total number of surveyed individuals, we can use the principle of inclusion-exclusion. Start with those who took calculus (34) and those who took statistics (19). Since 3 students took both subjects, we avoid double-counting them. Thus, the calculation is:
Total = (Calculus only) + (Statistics only) + (Both) + (Neither)
= (34 - 3) + (19 - 3) + 3 + 11
= 31 + 16 + 3 + 11 = 61.
Option A (39) undercounts participants, failing to account for all groups. Option B (42) also misses several individuals. Option D (67) overestimates by incorrectly adding too many participants.
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