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3 years ago

(b) Draw a four sided figure which has

Mathematics

1 answer:

Vlad [161]3 years ago

8 0

Answer:

Step-by-step explanation:

draw any angle which has like a edge inside it. like anything.

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A study of the relationship between age and various visual functions (such as acuity and depth perception) reported the followin

maks197457 [2]

Answer:

(a) $\sum x_i=56.68$ and $\sum x_i^2=197.46$

(b) The sample variance is $s^2=0.530$ and the sample standard deviation is $s=0.728$

Step-by-step explanation:

(a)

The sum of these 17 sample observations is

$\sum x_i=2.79\:+2.57+\:2.73\:+3.75\:+2.27+\:2.75+\:4.00+\:4.22+\:3.88+\:4.35+\:3.41+\:4.57+\:2.38+\:3.73\:+2.75+\:3.47+\:3.06\\\\\sum x_i=56.68$

and the sum of their squares is

$\sum x_i^2=2.79^2\:+2.57^2+\:2.73^2\:+3.75^2\:+2.27^2+\:2.75^2+\:4.00^2+\:4.22^2+\:3.88^2+\:4.35^2+\:3.41^2+\:4.57^2+\:2.38^2+\:3.73^2\:+2.75^2+\:3.47^2+\:3.06^2\\\\\sum x_i^2=197.46$

(b)

The sample variance, denoted by $s^2$ , is given by

$s^2=\frac{S_{xx}}{n-1}$

where $S_{xx} =\sum x_i^2-\frac{(\sum x_i)^2}{n}$

Applying the above formula we get that

$S_{xx}=197.46-\frac{(56.68)^2}{17}\\\\S_{xx} =8.482$

$s^2=\frac{8.482}{17-1}=0.530$

The sample standard deviation, denoted by <em>s</em>, is the (positive) square root of the variance:

$s=\sqrt{s^2}$

Applying the above formula we get that

$s=\sqrt{0.530}=0.728$

3 0

3 years ago

Joy makes 6.5 litres of soup, correct to the nearest 0.5 litre. She serves the soup in 280 ml portions, correct to the nearest 1

Levart [38]

Answer:

Joy definitely does have enough soup for 22 people.

Step-by-step explanation:

Upper Bound: 285ml turn it to 0.285 L 10÷2=5

280ml :

Lower Bound: 275ml turn it to 0.275 L

Upper Bound: 6.75 L 0.5÷2=0.25

6.5 Litters :

Lower Bound:6.25 L

6.75÷0.275=24.54 or 25

6.25÷0.285=21.92 or 22

7 0

3 years ago

Read 2 more answers

brigham bought a soda for $1.25 nancy bought a soda for $1.99 how much more did nancy pay for her soda

Pie

Nancy's soda was 74 cents ($0.74) mo0re than Brigham's soda.

8 0

3 years ago

Read 2 more answers

16a + 7c^2 + 5 - 7a+c

umka21 [38]

Answer:

9a + 7c² + 5 + c

Step-by-step explanation:

$16a + {7}^{2} + 5 - 7a + c$

$16a - 7a = (16 - 7)a = 9a$

$\boxed{\green{= 9a + {7c}^{2} + 5 + c}}$

3 0

3 years ago

Answer the questions below and show all of your

defon

Answer:

6.75

Step-by-step explanation:

729=1/2*216h

729=108h

h=6.75

I think idrk

3 0

3 years ago