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RUDIKE [14]
3 years ago
5

Plz helpp. In a high school with 5,000 students, the number of text messages sent by each student during a particular month was

recorded. The mean number of text messages sent during the month was 55 per student.
If the data was normally distributed, and if the standard deviation of the data was 4 text messages, which of these is the BEST estimate for the number of students who sent fewer than 51 text messages during the month?


A) 800

B) 1,200

C) 1,600

D) 1,700
p.s i already did it and its a)800
Mathematics
1 answer:
vampirchik [111]3 years ago
8 0

Answer:

A) 800

Step-by-step explanation:

I am on a challenge and I need points plus you told me

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3⋅ 3/5 (3/5 is a fraction)
LUCKY_DIMON [66]
Well its a simplest form of zero and 6 tenths and if u divide it by 2 youll get 3/5 as a fraction
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Find the dimensions of the square <br> Area=441cm over 2
MA_775_DIABLO [31]

Answer:

each side is 55.125cm

Step-by-step explanation:

you have to divide the area by 2

then do 441/2=220.5

then divide this by 4 because a square has 4 equal sides so 220.5/4=55.125

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3 years ago
Match each equation on the left to the mathematical property it uses on the right.
erma4kov [3.2K]

Answer:

The answer to your question is:

Step-by-step explanation:

(4 + 5) + 2 = 4 + (5 + 2)                     Associative property of addition

2(2x + 4) = 4x + 8                             Distributive property

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6 0
3 years ago
Read 2 more answers
Express 0.000216 in scientific notation
damaskus [11]
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3 0
2 years ago
the numbers of girls in the choir is 4 times the number of boys in the choir .the total number of students is 60..how many girls
Inessa05 [86]
First, make up some variables to represent the number of Girls and Boys in the choir.  

B = number of boys
G = number of girls

You know that there are 4 times as many girls in the choir as boys.  Therefore, the equation you can write is:
\frac{B}{G} =  \frac{1}{4}

If you cross-multiply, then you get the simplified equation:
G = 4B

Intuitively this makes sense since if you multiplied the number of boys in the class by 4, that would be equal to the number of girls you have.

Now, we know that the total class size is 60. So girls plus boys equals 60:
G+B = 60

To solve the equation, replace the G in this equation with the replacement you found before, 4B.
G + B = 60 -->
4B + B = 60 -->
5B = 60 -->
B = 12

However, you are trying to find the number of girls, so plug the answer back into your equation.
G + B = 60 -->
G + 12 = 60 -->
G + 12 -12 = 60 - 12 -->
G = 48

The number of girls you have is 48.

6 0
3 years ago
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