X-20(8)=x(15).....................
Answer:
C. The principal randomly selects homeroom classes and surveys each student in the chosen classes.
Step-by-step explanation:
Middle school is 6-8th. Surveying only the eighth-grade students won't give a representative sample of the whole school only the eighth-graders. Option A is incorrect.
Surveying only the students in detention represents a very small amount of students compared to the school, therefore it is not a representative sample. Option B is incorrect.
Yet again, the students in the math club is a small amount of students compared to the school. It does not represent the entire, or majority of the population. Option D is incorrect.
Picking students from homeroom classes and surveying each will give a wider variation of opinions from each grade and therefore a representative sample. Option C is the correct answer.
Answer:
The mistake is evidently in the addition of the first 5 bowling scores
Step-by-step explanation:
Brenda had bowling scores 92, 110, 85, 78, and 96.
She needs one more bowl to get an average of 96.
Let the last bowl score = x
(92 + 110 + 85 + 78 + 96 + x)/6 = 96
(92 + 110 + 85 + 78 + 96 + x) = 96×6 = 576
461 + x = 576
x = 576 - 461 = 115
The mistake is evidently in the addition of the first 5 bowling scores, the score for the 5th bowl was excluded, maybe because it was coincidentally 96 too.
She added (92 + 110 + 85 + 78) instead of (92 + 110 + 85 + 78 + 96), so, the score needed for the last bowl to get an average of 96 is actually 115, not 211.
Hope this Helps!!!
Answer:
87.5
Step-by-step explanation:
40% = 35
1% = 0.875
x = 0.875 x 100 = 87.5
Answer:
D is the answerf(-6)=36;f(2)=2
