For a 2:7 ratio there would be 100 boys and 350 girls
Answer:
The answers are, "John saves $35 dollars the first week" and "John is saving at a faster rate than Barb"
Answer:$18
Step-by-step explanation:
<span>they built 2.22 km per day I think</span>
Answer:
The correct option is (C) (2.769, 3.231).
Step-by-step explanation:
The confidence interval for mean when the standard deviation is not known is:

Given:

Compute the critical value as follows:

**Use a <em>t</em>-table.
The 95% confidence interval for true mean length of the bolt is:

Thus, the 95% confidence interval for true mean length of the bolt is (2.769, 3.231).
The correct option is (C).