Answer:
1.980
Step-by-step explanation:
Given that a random sample of 120 SAT scores of students applying for merit scholarships showed an average of 1400 with a standard deviation of 240
Here nothing mentioned about the distribution but sample size is very large.
Since population std deviation is not known, only sample std deviation is used.
t test will be more appropriate.
df = degrees of freedom = n-1=119
For two tailed 95% level, t critical value for 119 df would be
1.980
Using this critical value confidence interval would be formed.
Answer:
Not sure if this is correct but I think 100 meters. Because he was directly south, meaning the extra 5° doesnt matter at this point.
Answer:
Step-by-step explanation:
The object shown above consists of 5 cubes having side lengths of ⅖m each.
Volume of a cube = 
Where, a = side length = ⅖ m
Volume of the object = 
Answer:
Option D. 5890.5 feet²
Step-by-step explanation:
An individual head of a sprinkler system covers a circular are of grass with a radius of 25 feet.
Yard has three sprinkler heads that each cover circular area with no overlap.
We have to calculate the approximate area watered by these 3 sprinkler heads.
Area covered by one sprinkler = π×r² = π×(25)² = 625π feet²
Therefore area covered by three sprinkler heads = 3 × 625π = 5892.85 feet²
which matches the approximate value of Option D. 5890.5 feet²
