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erik [133]
2 years ago
14

Exam grades: Scores on a statistics final in a large class were normally distributed with a mean of 77 and a standard deviation

of
10. Use the TI-84 PLUS calculator to answer the following. Round the answers to at least two decimals.
(a) Find the 28th percentile of the scores.
(b) Find the 65th percentile of the scores.
(c) The instructor wants to give an A to the students whose scores were in the top 12% of the class. What is the minimum score
needed to get an A?
(d) Between what two values are the middle 64% of the scores? (Enter the smaller number in the first box.)
Mathematics
1 answer:
vekshin12 years ago
7 0
Are all of those questions I think it’s C
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What relationship do the ratios of sin x° and cos y° share?
puteri [66]

Answer:

The ratios are both identical (3/5 and 3/5).

Step-by-step explanation:

sin x° is equivalent to O/H, or the opposite/hypotenuse sides of the triangle. Therefore:

sin x° = 3/5.

cos y° is equivalent to A/H, or the adjacent/hypotenuse sides of the triangle.

cos y° = 3/5.

\frac{3}{5} =\frac{3}{5}

The ratios are identical.

8 0
2 years ago
1/2 (x−8)+1=2( 1 8 x−1)
nalin [4]

Answer:

The solution for the given algebraic equation is \frac{ - 2}{71}

Step-by-step explanation:

Given algebraic equation as :

\frac{1}{2} ( x - 8 ) + 1 = 2 ( 18 x - 1 )

Now solving the equation while opening the brackets

So, \frac{1}{2} × x - \frac{1}{2} × 8  + 1 = 2 × 18 x - 2

Or, \frac{x}{2}  - \frac{8}{2}  + 1  = 36 x - 2

or,  \frac{x}{2}  - 4 + 1 = 36 x - 2

or,  \frac{x}{2}  - 3 = 36 x - 2

or,  \frac{x}{2} - 36 x = - 2 + 3

Or,  \frac{x}{2} - 36 x = 1

or, \frac{x - 72 x}{2} = 1

or, \frac{- 71 x}{2} = 1

∴ 71 x = - 2

I.e x = \frac{ - 2}{71}

Hence The solution for the given algebraic equation is \frac{ - 2}{71}    Answer

7 0
3 years ago
A circle has a diameter of 42 cm. Find
KATRIN_1 [288]

I think your answer should be 100 cm...

Hope this helps

8 0
3 years ago
Ashley has 500 songs in his music player. Every week he adds 10 songs to his collection. How many songs will he have in his musi
anygoal [31]
500 songs in his music player: + 500
every week he adds 10 songs: 10n (n is how many weeks) 
equation: s = 10n + 500 (s is the total amount of songs)
after 20 weeks? : plug it in
s = (10 x 20) + 500
s = 200 + 500
s = 700
he will have 700 songs in his music player after 20 weeks
8 0
3 years ago
Find (-5x + 6) - (-2x - 7)
Setler79 [48]
The answer is: -3x +13
7 0
3 years ago
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