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slavikrds [6]
3 years ago
9

What is the mean of 70,68,72,66,68,69,66,71,74,66

Mathematics
1 answer:
sveticcg [70]3 years ago
6 0
Hey there! :)

To find mean, you have to add all the numbers and divide it by how many numbers there are.

70 + 68 + 72 + 66 + 68 + 69 + 66 + 71 + 74 + 66 = 690

There are 10 numbers

690 ÷ 10 = 69

Mean ⇒ 69

:)
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Explain why if a runner completes a 6.2â-mi race in 32 âmin, then he must have been running at exactly 11 âmi/hr at least twice
MA_775_DIABLO [31]

Answer:

Accelerating to top speed, deaccelerating to finish line.

Step-by-step explanation:

If the runner kept a constant speed of 11 mph for the whole duration of his run (32 minutes), the distance he would have covered is:

d=11*\frac{32}{60}\\d= 5.87\ mi

This means that, in order to run the full 6.2 miles, the runner needs to reach a speed over 11 mph. Assume he starts from rest, while accelerating the runner reaches, and the surpasses, the 11 mph mark. Since his speed at the finish line is zero, the runner has to deaccelerate from his current running speed (which should be higher than 11 mph), passing through 11 mph and reaching zero at the finish line.

3 0
3 years ago
Find the interest due on $250 at 11% for 2 years.<br> A.) $55.00<br> B.) $57.00<br> C.) $54.00
BlackZzzverrR [31]

Answer:

the answer is a

Step-by-step explanation:

because 250 x 11% equals 27.5 and 27.5 x 2 equals 55. hope this helps

6 0
4 years ago
a glacier retreated 9.36 meters in 3 months. If the glacier reatreated the same number of meters each month, how many meters did
yan [13]

Answer:

3.12 meters in one month

Step-by-step explanation:

In three months if the glacier retreated 9.36 then you can find what it retreaded in one month by division so,

9.36/3=3.12 meters in one month

3 0
3 years ago
Ajoba and Prav drive to work. Ajoba drives 45 miles in 2.5 hours. Prav drives 74 km in 1 hour 15 minutes. Work out the differenc
amm1812

Answer:

Ajoba: 28.8km/h

Prav: 59.2km/h

The difference in speed is: 59.2-28.8=30.4km/h

Step-by-step explanation:

Ajoba:

d=45mi Convert to km // 45mi(\frac{1.6km}{1mi} )=72km

t=2.5h

v=? 28.8km/h

Prav:

d=74km

t=1h15m or 1.25h

v=? 59.2km/h

Formula: d=v*t

Solve for v;

v=\frac{d}{t}

v=\frac{72km}{2.5h} \\v=28.8km/h

--------------------------------------------

v=\frac{d}{t}

v=\frac{74km}{1.25h} \\v=59.2km/h

4 0
3 years ago
A jar contains nine blue marbles, eight yellow marbles, 11 black marbles, and 12 red marbles.
Serga [27]

Answer:

0

Step-by-step explanation:

0, because there are no white marbles in the jar. So it is impossible.

8 0
3 years ago
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