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Ilia_Sergeevich [38]

4 years ago

9

The histogram below shows the number of sit-ups accomplished by sixth grade students in a physical fitness test. How many studen

ts accomplished 29 sit-ups or less?

1 answer:

Tresset [83]4 years ago

7 0

Can you give a picture of the histogram?

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If the size of a scale drawing is 50 x 36 cm and the scale factor is 5:1 what is the size of the actual object?

inna [77]

Answer:

50*30=1500

Step-by-step explanation:

5 0

4 years ago

Okay I need ur help pls very urgent..

sveticcg [70]

Supplementary angles are those which sum upto 180°

$\angle 1+\angle2=180^{\circ}$

Complementary are those which sum to 90°

$\angle 1+\angle2=90^{\circ}$

so if you know one angle, you can find other.

8 0

3 years ago

Read 2 more answers

100 points please help

choli [55]

Answer:

She has $3.74 in quarters. I'm kind of confused but hopefully this helps??

Step-by-step explanation:

0.75 x 5= $3.75

$3.75/0.25= 15 quarters

4 0

3 years ago

Read 2 more answers

The data below were obtained from an experiment were participants were given drinks with or without caffeine and then asked to t

Black_prince [1.1K]

Answer:

The 95% confidence interval is $244.26 < \mu < 246.95$

The pivot function used is

$t = \frac{\=x - \mu}{ \frac{\sigma}{\sqrt{n} } }$

Step-by-step explanation:

From the question we are told that

The data given is 246 242 248 245 250 244 252 248 248 247 250 248 246 242 248 244 245 246 250 242

The sample size is $n= 20$

Given that the confidence level is 95% then the level of significance is

$\alpha = (100 - 95)\%$

$\alpha = 0.05$

The degree of freedom is mathematically represented as

$df = 20 -1$

$df = 19$

From the student t-distribution table the critical value of $\frac{\alpha }{2}$ is

$t_{\frac{\alpha }{2} , 19 } = 2.093$

The mean is mathematically represented as

$\= x = \frac{\sum x_i}{ n}$

$\= x = \frac{246+ 242 +248+245+ 250+ 244+252+ 248 +248 +247+ 250+ 248+ 246+ 242 +248 +244 +245 +246+ 250+ 242}{20}$ $\= x = 246.6$

The standard deviation is mathematically represented as

$\sigma = \sqrt{\frac{\sum (x_i - \= x )^2)}{n} }$

$\sigma = \sqrt{\frac{(246- 246.6)^2 +(242- 246.6)^2 +(248- 246.6)^2 + (248- 245)^2+}{20} } \ ..$

$\ ...\sqrt{\frac{(250-246.6 )^2+ (244- 246.6)^2+(252- 246.6)^2+ (248- 246.6)^2+ (248- 246.6)^2+}{20} } \ ...$

$\ ..\sqrt{\frac{(247- 246.6)^2+ (250- 246.6)^2+ (248-246.6)^2+ (246-246.6)^2+ (242-246.6)^2+ (248-246.6)^2+ (244-246.6)^2+}{20} } \ ...$ $\sqrt{\frac{ (245-246.6)^2+ (246-246.6)^2+ ( 246-246.6)^2 + ( 250-246.6)^2+ ( 242-246.6)^2 +( 246-246.6)^2+ ( 242-246.6)^2 }{20} }$ $\sigma = 2.87411$

The margin of error is mathematically represented as

$E = t_{\frac{\alpha }{2} , 19} * \frac{\sigma }{\sqrt{n} }$

$E = 2.093 * \frac{2.87411 }{\sqrt{20} }$

$E = 1.345$

The 95% confidence interval is mathematically represented as

$\= x - E < \mu < \= x + E$

=> $245.6 - 1.345 < \mu$

=> $244.26 < \mu < 246.95$

The pivot function used is

$t = \frac{\=x - \mu}{ \frac{\sigma}{\sqrt{n} } }$

8 0

4 years ago

What is 115/11 as a decimal

arlik [135]

10.45 is the anwer hopefully this was Hopeful

3 0

4 years ago