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arsen [322]
3 years ago
12

To determine her power usage​, Keri divides up her day into three​ parts: morning,​ afternoon, and evening. She then measures he

r power usage at 4 randomly selected times during each part of the day. What type of sampling did she use?
Mathematics
1 answer:
marusya05 [52]3 years ago
3 0

Answer:

Stratified Sampling

Step-by-step explanation:

Since Keri divides the day into different strata and each unit is selected from each strata randomly. So, it is Stratified Sampling.

Further, In Stratified Sampling population is divided into several groups such that within the group it is homogeneous and between the group it is heterogeneous. And now a selection of each stratum and unit has an equal chance of selection.

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HELP PLS 30) PTS
Verdich [7]

Answer:

32 ; 20

Step-by-step explanation:

Middle section: 26

Sum of parallel lengths: 2 × 26 = 52

Ratio of the sides:

100% : 62.5%

8 : 5

5/(8+5) × 52

20

8/(8+5) × 52

32

6 0
3 years ago
Find each unit price. Which is the better by? Explain please.
Luda [366]
1.49/3

0.5 dollars per feet.

This is a fraction equal to 1.49/3.

We want a unit rate where 1 is the denominator, so we divide the top and bottom by 3.

The answer is 0.49666667, which can be rounded to 0.5
5 0
3 years ago
Read 2 more answers
The speed of the current is 7 mph. The boat travels three times slower against the current than with the current. What is the sp
kotykmax [81]
Let the speed of the boat be x
so going against the current the speed is x-7
going with the current the speed is x+7

let the distance be d
time = distance / speed
time to go against the current = d/(x-7)
time to go with the current = d/(x+7)

time going against the current is 3 times going <span>with the current
</span>
d/(x-7) = 3d/(x+7)     ⇒⇒⇒ divide by d 
1/(x-7) = 3/(x+7) 
x+7 = 3(x-7) 
x+7 = 3x - 21
2x = 28
x = 14

So, the speed of the boat in still water is = 14 mph
3 0
3 years ago
Write a verbal sentence to represent 5x+7=18
Romashka-Z-Leto [24]
Five times x plus seven equals eighteen 
7 0
3 years ago
Read 2 more answers
Emily and Zach read a total of 32 books in four months. Emily read 12 books. Which equations
DerKrebs [107]

Answer:

D

Step-by-step explanation:

you take away 12 from the total and you'll find how many Zach read (20) then 12+20=32

4 0
2 years ago
Read 2 more answers
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