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Arte-miy333 [17]
3 years ago
10

The reaction times for a random sample of 9 subjects to a stimulant were recorded as 2.5, 3.6, 3.1, 4.3, 2.9. 2.3, 2.6, 4.1, and

3.4 seconds. Calculate (a) the mean; (b) the median. 8.4 The number of
Mathematics
1 answer:
Helen [10]3 years ago
6 0

Answer:

Mean is 3.2

Median is 3.1

Step-by-step explanation:

a) mean

= (2.5+3.6+3.1+4.3+2.9+2.3+2.6+4.1+3.4)/9

= 28.8/9

= 3.2

b) median: we will arrange in ascending order and pick the middle term.

2.3 2.5 2.6 2.9 3.1 3.4 3.6 4.1 4.3

From the above order, 3.1 is the middle term and is the median

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Which expression is equivalent to 2√28+2√63
ArbitrLikvidat [17]

2\sqrt{28}+2\sqrt{63}=2\sqrt{4\cdot7}+2\sqrt{9\cdot7}=2\sqrt4\cdot\sqrt7+2\sqrt9\cdot\sqrt7\\\\=2(2)\sqrt7+2(3)\sqrt7=4\sqrt7+6\sqrt7=\boxed{10\sqrt7}

7 0
3 years ago
(2x3)over 2-5 over 2
matrenka [14]

Answer:

2x3/2-5/2

=6/-3/2

=-1

6 divide by 2 is +3 and +3 divide by - 3 equals - 1

6 0
3 years ago
Describe the sets of points in space whose coordinates satisfy the given inequalities or combinations of equations and inequalit
Lemur [1.5K]

Answer:

Step-by-step explanation:

This is a circle with radius 2 and z = y

All points on or within the circle x2 + y2 +4 and in the plane z = y

6 0
3 years ago
I NEED HELP WITH THIS QUESTION!!!!
Firdavs [7]

9514 1404 393

Answer:

  see attached

  (x, y) = (8, 4)

Step-by-step explanation:

The relations given in the problem statement let you write two equations. One for the number of shots, and one for the number of points. The variables x and y are defined in the problem statement.

  x + y = 12 . . . . . total number of shots

  x + 2y = 16 . . . . total number of points

__

These equations are easily plotted by considering their x- and y-intercepts. The x-intercepts of the equations are found when y=0, so are 12 and 16, respectively.

The y-intercepts are found when x=0, so are 12 and 8, respectively. The two lines are shown in the attached. The first is blue; the second is red. Their point of intersection at (x, y) = (8, 4) is circled.

  • the number of free throws Angel made was 8
  • the number of 2-point shots Angel made was 4

7 0
3 years ago
Read 2 more answers
How many eighty-fours are in 672?
Vlad1618 [11]

Answer: 8

Step-by-step explanation:

We only need to take  672/84 = 8

So there are 8

If you can please give me a Brainliest, I only need 1 more to become an Ace, thank you!

3 0
1 year ago
Read 2 more answers
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