He has to drive around the track about 1.5 times.

We first find the circumference:

C = 2πr = 2(3.14)(1.6) = 10.048

We now divide 15 by this:
15/10.048 ≈ 1.5

8 0

2 years ago

Govo<br> Raisins cost 87¢ for 3 boxes. What is<br> the unit cost, or price per box?

sineoko [7]

Answer:

$ .29 per box is the answer.

Step-by-step explanation:

What you are going to do is divide.

$ .29 per box is the answer.

4 0

2 years ago

A student records the repair cost for 17 randomly selected stereos. A sample mean of $52.33 and standard deviation of $21.44 are

Dafna11 [192]

Answer:

90% confidence interval is (43.25, 61.41)

Step-by-step explanation:

Given that,

n = 17

Mean, $\bar{x}$ = 52.33

Standard deviation, $\sigma$ = 21.44

∝ = 0.10

Now,

Confidence interval = $\bar{x}$ ± $t_{\frac{\alpha }{2}, n-1} [\frac{\sigma}{\sqrt{n} } ]$

= 52.33 ± 1.7646 [ 21.44 / √17 ]

= 52.33 ± 9.0791

So,

52.33 + 9.0791 = 61.4091

52.33 - 9.0791 = 43.2509

So,

90% confidence interval is (43.25, 61.41)

Also,

Lower end-point = 43.25

Upper end-point = 61.41

4 0

2 years ago