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kap26 [50]
3 years ago
8

49 students are selected at random from sophomore class 39 from the junior class and 48 from senior class what type of sampling

is used simple random ,stratified , systematic ,convenience
Mathematics
1 answer:
tankabanditka [31]3 years ago
3 0

Answer:

(B)Stratified

Step-by-step explanation:

Stratified sampling refers to a sampling method in which the entire population is first divided into groups/strata before a random sample is taken from each strata.

The school population in this case has been divided into these strata,

  • Sophomore class
  • Junior class; and
  • Senior class

From these classes, a random sample of 49,39 and 48 students respectively was then taken,

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jeka94

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3 years ago
What's the answer for <br>3.4a=57.8
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3 years ago
What is 33/84 in the simplest form
VARVARA [1.3K]
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7 0
4 years ago
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gladu [14]

Answer:

B

Step-by-step explanation:

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7 0
3 years ago
The area of a square floor on a scale drawing is 64 square centimeters, and the scale drawing is 1 centimeter:3 ft. What is the
Oxana [17]

Answer:

Part a) The area of the actual floor is 576\ ft^{2}

Part b) The ratio of the area in the drawing to the actual area is \frac{1}{9}\frac{cm^{2}}{ft^{2}}

Step-by-step explanation:

we know that

The scale drawing is \frac{1}{3}\frac{cm}{ft}

step 1

Find the dimensions of the square on a scale drawing

The area of a square is equal to

A=b^{2}

where

b is the length side of the square

A=64\ cm^{2}

so

64=b^{2}

b=8\ cm

step 2

Find the dimensions of the actual floor

Divide the length of the floor on the drawing by the scale drawing

8/(1/3)=24\ ft

step 3

Find the area of the actual floor

The area of a square is equal to

A=b^{2}

substitute

A=24^{2}=576\ ft^{2}

step 4

Find the ratio of the area in the drawing to the actual area

\frac{64}{576}\frac{cm^{2}}{ft^{2}}

Simplify

Divide by 64 both numerator and denominator

\frac{1}{9}\frac{cm^{2}}{ft^{2}}

3 0
3 years ago
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