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Neko [114]
3 years ago
6

A quiz consists of 20 multiple-choice questions find mean and standard deviation

Mathematics
1 answer:
worty [1.4K]3 years ago
4 0

Since the problem is quite vague because the number of choice per question is not written here. I’ll just put for 4 choices and 5 choices each.

To compute for the 5 choices each:

Mean = np = 20 (1/5) = 4

Standard deviation = sqrt(npq) = sqrt (4*(4/5) = 1.79

 

To compute for the 4 choices each:

Mean = np = 20 (1/4) = 5

Standard deviation = sqrt(npq) = sqrt (5*(4/5) = 2

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I’m very confused please explain how to answer #1 with the info provided
ANEK [815]

Answer:

The population in 2039 would be;

117,726

<em>Note</em><em>: this value can be confirmed by using the spreadsheet to extrapolate values.</em>

Explanation:

Given that the population in 2019 was;

103,126

And the population in 2020 was;

103,856

The population growth can be modeled with a linear equation;

y=mx+b

The slope m is given as;

m=730

And b would be the value of y at x=0.

where x is the number of years after 2019;

b=103,126

the model can then be written as;

y=730x+103,126

At year 2039, x would be;

x=2039-2019=20

substituting the value of x into the model;

\begin{gathered} y=730(20)+103,126 \\ y=117,726 \end{gathered}

Therefore, the population in 2039 would be;

117,726

<em>Note: this value can be confirmed by using the spreadsheet to extrapolate values.</em>

5 0
1 year ago
I need you help please help me please I need your help
Llana [10]

Answer:

4

Step-by-step explanation:

at x=3

since x=3 means x>= 1

use x+1 = 3+1=4

3 0
3 years ago
What is the number of possible outcomes when tossing 5 coins at once?
drek231 [11]
<span>Each coin can be either heads or tails. The number of outcomes is equal to the amount of values the coins can take on (two) raised to the number of coins being tossed (five). Two times itself five times (2*2*2*2*2) equals 32 possible outcomes.</span>
3 0
4 years ago
Y=-2x+5 how do you solve?
Alex73 [517]

Answer:

here are the coordinates :

(0,5) and (1,3)

3 0
3 years ago
Lucia has 10 dimes and nickels worth a total of $0.60. Use the graph to find the number of dimes and nickels that Lucia has.
Reil [10]
The system has one solution, so it is consistent independent. The graphs intersect at the point (2, 8), which can be checked algebraically. Complete a table of values for each line.

The point (2, 8) is the solution to the system of equations. Since (2, 8) is the solution to the system of equations, Lucia has 2 dimes and 8 nickels. 

hope it helps :) feel free to ask anymore questions 

5 0
3 years ago
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