All categories

3 years ago

Rock can read 10 books in 30 minutes. How long does it take rock to read 15 books, if the speed is consistent?

1 answer:

3 0

Divide 30 by 10 to see how long it takes him to read 1 book (30/10=3). Then multiply 3 by 15 to see how long it takes him to read 15 books (3x15=45). It takes Rock 45 minutes to read 15 books :)

You might be interested in

Write the equation of the line passing through point (-6,0) and perpendicular to y=3/2 x

aksik [14]

Answer:

option c

Step-by-step explanation:

explaination is in pic below

3 0

2 years ago

Mopeds (small motorcycles with an engine capacity below 50 cm3) are very popular in Europe because of their mobility, ease of op

Mashcka [7]

Answer:

a) P(X<50)=0.9827

b) P(X>47)=0.4321

c) P(-1.5<z<1.5)=0.8664

Step-by-step explanation:

We will calculate the probability based on a random sample of one moped out of the population, normally distributed with mean 46.7 and standard deviation 1.75.

a) This means we have to calculate P(x<50).

We will calculate the z-score and then calculate the probability accordign to the standard normal distribution:

$z=\dfrac{X-\mu}{\sigma}=\dfrac{50-46.7}{1.75}=\dfrac{3.7}{1.75}=2.114\\\\\\P(X$

b) We have to calculatee P(x>47).

We will calculate the z-score and then calculate the probability accordign to the standard normal distribution:

$z=\dfrac{X-\mu}{\sigma}=\dfrac{47-46.7}{1.75}=\dfrac{0.3}{1.75}=0.171\\\\\\P(X>47)=P(z>0.171)=0.4321$

c) If the value differs 1.5 standard deviations from the mean value, we have a z-score of z=1.5

$z=\dfrac{(\mu+1.5\sigma)-\mu}{\sigma}=\dfrac{1.5\sigma}{\sigma}=1.5$

So the probability that maximum speed differs from the mean value by at most 1.5 standard deviations is P(-1.5<z<1.5):

$P(-1.5$

3 0

3 years ago

4. Ideal amount of children

Vaselesa [24]

Answer:

Step-by-step explanation:

Formula:

$\frac{sum of all numbers added together}{total amount of numbers}$

$\frac{21}{7}$ = 3

3 0

2 years ago

A chemistry professor suspects that there is a relationship between the number of classes a student misses and that student’s sc

Airida [17]

Answer:

Interference for regression

Explanation:

Interference for regression is the most suitable statistical test to use to find out if there is any link between number of missed classes and the final test scores.

Because those two variables are related and student test score can be predicted using number of classes that are missed.

5 0

2 years ago

Change 46% into fraction

PSYCHO15rus [73]

Answer:

46/100 = 23/50

Step-by-step explanation:

I hope this helped plzz mark me as brainliest plzzzz

7 0

3 years ago