Answer:
6 hours 26 minutes
Step-by-step explanation:
<h3>
Answer: 20 </h3>
=====================================================
Reasoning:
The empirical rule says that about 68% of the population is within 1 standard deviation of the mean. This applies to the normal distribution.
The mean in this case is 72 and the standard deviation is 7.
One standard deviation below the mean is 72-7 = 65, while one standard deviation above the center point is 72+7 = 79. This is visually shown as the closest tickmarks to the center 72. Each tickmark represents a unit of standard deviation (eg: 85 is two standard deviations above the mean, since it's 2 tickmarks above 72).
Saying "within 7 points of the mean" therefore is the same as saying "the score is between 65 and 79, inclusive of both endpoints".
So you're teacher is asking how many students got between 65 and 79. As mentioned at the very top, roughly 68% of the population fits this description.
Meaning,
68% of 30 = 0.68*30 = 20.4 = 20 students got a quiz score within seven points of the mean.
Answer:
1) 1 ounce costs 46 cents. 2) 1 ounce of cornflakes costs 19 cents ( 0.19125).
3) 1 once cornflakes is 16 cents (0.1608) ( 36-ounces). 4) The 36 ounce box is a better buy.
Step-by-step explanation:
Divide the cost by the number of x units to find the cost of one unit. You are welcome.
Answer:
<h2>B. 3,4 Volt</h2>
Step-by-step explanation:
Here we need to use Ohm's Law, because we have electric current, voltage and resistances. This law state: 
So, first we need to calculate the total resistance to then find the voltage. The resistances can be placed in two ways: in parallel, in series.
The pair 4 and 8 ohms are parallel, so we solve:
Which is, 
Now, this total resistance of parallels ones is placed in series with the 3 ohm resistance, in this case we just sum, because they are in series:
Now that we have the total resistance of the circuit, we use the Ohm's Law:
Therefore, the right answer is B.
Answer:
It's probably D or C, as you clicked.
Step-by-step explanation:
