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andre [41]
2 years ago
5

Can someone help me on this please

Mathematics
2 answers:
Nina [5.8K]2 years ago
7 0
Hi i hope you're having a good week
harkovskaia [24]2 years ago
4 0
The answer is 179.59

Hope this helps
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1.44 Make-up exam: In a class of 28 students, 27 of them took an exam in class and 1 student took a make-up exam the following d
Olenka [21]

Answer:

a) Decrease

b) New mean = 78.43

c) Decrease                        

Step-by-step explanation:

We are given the following in the question:

Total number of students in class = 28

Average of 27 students = 79

Standard Deviation of 27 students = 6.5

New student's score = 63

a) The new student's score will decrease the average.

b) New mean

Mean = \displaystyle\frac{\text{Sum of all observations}}{\text{Total number of observation}}

Mean = \dfrac{\displaystyle\sum x_i}{27} = 79\\\\\sum x_i = 27\times 79 = 2133

New mean =

\text{ New mean} =\dfrac{ \displaystyle\sum x_i +63}{28}\\\\ =\dfrac{2133+63}{28}= \dfrac{2196}{28} = 78.43

Thus, the new mean is 78.43

c) Since the new mean decreases, standard deviation for new scores will decrease.

This is because the new value is within the usual values i.e. within two standard deviations of the mean. So, this wont cause a lot of variation as this value will be closer to already available data values. Also number of observations (n) in the denominator is increasing. Based on both these points we can conclude that standard deviation will decrease

Formula for Standard Deviation:

\text{Standard Deviation} = \sqrt{\displaystyle\frac{\sum (x_i -\bar{x})^2}{n}}  

where x_i are data points, \bar{x} is the mean and n is the number of observations.

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3 years ago
Solve the following quadratic equation:
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Answer:

-3.5 or -6

Step-by-step explanation:

2x^2+19x+40=-2

2x^2+19x+40+2=0

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2x^2+(12+7)x+42=0

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2x(x+6)+7(x+6)=0

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either,

x+6=0

x=-6

or,

2x+7=0

2x=-7

x=-7/2

x=-3.5

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3 years ago
AB || DE<br><br> Find: <br> m∠A = m∠<br> by reason <br> m∠ACB = m∠<br> by reason
swat32
If you find a first you will be able to find b a little faster then it is super easy after that you got this!
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3 years ago
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5/x^2+3x-2y is polynomial
Maurinko [17]

Answer:

nope

Step-by-step explanation:

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If a normal distribution has a mean of 104 and a standard deviation of 6 what is the z score for a value of 110?
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The answer to your question is 1 my friend.

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