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miskamm [114]
3 years ago
13

What is the first error he made in computing the standard deviation?

Mathematics
2 answers:
artcher [175]3 years ago
7 0
B.yuri divided by n instead of n-1
vivado [14]3 years ago
6 0

Answer:

Step-by-step explanation:

Given is a sample with 4 items as

12,9,14,21

Mean = average of 4 = 14

s is the square root of sample variance

Sample variance is the sum of squares divided by n-1

But Yuri divided by 4 = n instead of 3 = n-1

That is the only mistake he did and all other steps are right.

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(11) U
monitta

Answer:

More clarification

Step-by-step explanation:

2 of a white ball =2/30 =1/15;

This is the probability of picking a black ball.

Let the number of black ball be X

x/(x +20)= 1/15[ probability of picking black ball ]

15x = x + 20 ; by cross multiplication

14x=20; x = 20/ 14 =1.42 = 1 [ approximately]

But to satisfy the premise given above; we have to approximate the no of balls to 2

3 0
4 years ago
Suppose a football player kicks a ball and gives it an initial upward velocity of 47 ft/s. Use the formula h(t)= -16t^2+47t+3 wh
statuscvo [17]

Answer:

Step-by-step explanation:

a. when t=0,h=3ft

h(t)=-16 (t^2-\frac{47}{16}x+(\frac{47}{32} )^2)+\frac{47^2}{32^2} *16+3\\=-16(t-\frac{47}{32})^2+\frac{2209}{64}+3\\=-16(t-\frac{47}{32})^2+\frac{2209+192}{64}\\when~ t=\frac{47}{32}\\h=\frac{2301}{64}\\or~v^2-u^2=2gh\\\\0^2-47^2=2*(-32)h\\or h=\frac{47^2}{64}=\frac{2209}{64} \\height from the ground=\frac{2209}{64} +3=\frac{2301}{64}

c.t=47/32 sec

d.

time taken to fall 2301/64 ft=0*t+\frac{1}{2}*32*t^2

t^2=\frac{2301}{64*16}

t=\frac{\sqrt{2301}}{8*4}=\frac {47.97}{32}

total ~time=\frac{47+47.97}{32}=\frac{94.97}{32} sec

4 0
3 years ago
Two students started at the coordinate (0,0). Student A
Sati [7]

Answer:

(7,5) (4,1)= (3,4) might be it Im not really sure

6 0
3 years ago
Read 2 more answers
Find the output y when the input x is -5<br> y=?
antiseptic1488 [7]

Answer: y=7

Step-by-step explanation: looking at the graph when x is -5 y= 7

3 0
3 years ago
Hope ya'll have a blessed day:) <br> here's some free points.
raketka [301]

Answer: Aww thx! Very kind of chu!

Have an amazing day!

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
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