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Ganezh [65]
3 years ago
7

$\mbox{The mean of a set of test scores is 86 and the standard deviation is 3. }$

Mathematics
1 answer:
ziro4ka [17]3 years ago
6 0
For a normally distributed data set, approximately 68.27% of the data is within one standard deviation. i.e. approximately 0.6827 x 200 = 137 test scores is between 86 + or - 3 i.e. from 83 to 89. Hence approximately 137/2 = 68 test score is within the 86 to 89 range.
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Find the sum of the predecessor of the predecessor of 2987 and successor of the greatest 3 digits number is __________
grin007 [14]

Answer:

3985

Step-by-step explanation:

Note: predecessor means a number before for example  predecessor of 4 is 3. Similarly, successor is a number after for example the successor of 4 is 5.

The  predecessor of the predecessor of 2987  = 2987-2 = 2985

Let 2985 be x

The greatest 3 digit number = 999

And the successor of the greatest 3 digits number would be = 999+1 = 1000

let 1000 be y

We have find  the sum of x and y

= 2985+1000

= 3985

4 0
3 years ago
What is the mode of the data set 7, 8, 2, 3, 9, 3, 7.<br><br> A: 2<br> B: 9<br> C: 3 and 7 <br> D: 3
Delvig [45]

Step-by-step explanation:

✰ \underline{ \underline{ \large{ \tt{G \: I \: V \: E \: N\: D\: A\: T \: A : }}}}

  • 7 , 8 , 2 , 3 , 9 , 3 , 7

Here ,

  • Frequency of 7 = 2
  • Frequency of 8 = 1
  • Frequency of 2 = 1
  • Frequency of 3 = 2
  • Frequency of 9 = 2

➺ 7 and 3 has the highest frequency i.e 2. So , Mode of the given data is 3 & 7 .

\boxed{ \boxed{ \tt{Our \: Final \: Answer :   \boxed{\tt{3 \: and \: 7}}}}}

Hope I helped ! ♡

Have a wonderful day / night ! ツ

☞ \underbrace{ \mathfrak{Carry \: On \: Learning}} !! ✎

▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁

5 0
3 years ago
Determine the slope of y=3x^2-8 at (x,y)
romanna [79]
By definition, the slope of a curve is the rate of change of the independent and dependent variables. When graphed in a Cartesian plane, the slope between any two point on the curve is equal to Δy/Δx. However, we should not that only a linear function has a constant slope. For this problem, the equation is quadratic. Hence, you must specify the point where we should get the slope.

In calculus, the slope is the first derivative of the equation:

<span>y=3x</span>²<span>-8
dy/dx = slope = 6x - 0

Thus, the slope at any point of the curve is 6x. For instance, you want to find the slope of the curve at point (1,1), then the slope is equal to 6(1) = 6 units.</span>
8 0
3 years ago
Fint the roots for h(x) = (2x + 3) (x - 7)
prohojiy [21]

Answer:

hi

Step-by-step explanation:

7 0
3 years ago
Write an equation of the line containing the point (3,1) and perpendicular to the line 5x-3y=5
dusya [7]
Th answer is: y=-1/5x+8/5
7 0
3 years ago
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