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Paladinen [302]
3 years ago
13

the ratio of red marbles to blue marbles in a bag is 2 to 3 .which of the following could be the number of red and blue marbles

in the bag ​
Mathematics
2 answers:
nlexa [21]3 years ago
8 0
Answer should be: 1/2
Andreas93 [3]3 years ago
5 0

Answer:

1/2

Step-by-step explanation:

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The time to complete an exam is approximately Normal with a mean of 70 minutes and a standard deviation of 10 minutes. Using the
MatroZZZ [7]

Answer:

16% of students will complete the exam in less than 60 minutes

Step-by-step explanation:

The Empirical Rule(68-95-99.7) states that, for a normally distributed random variable:

68% of the measures are within 1 standard deviation of the mean.

95% of the measures are within 2 standard deviation of the mean.

99.7% of the measures are within 3 standard deviations of the mean.

In this problem, we have that:

Mean = 70

Standard deviation = 10

What percentage of students will complete the exam in less than 60 minutes

60 = 70-10

So 60 is one standard deviation below the mean

By the Empirical Rule, 68% of the measures are within 1 standard deviation of the mean, that is, from 60 to 80 minutes. The other 100-68 = 32% is outside this interval. Since the normal distribution is symmetric, 16% of those are below 60 and 16% of those are above 80.

16% of students will complete the exam in less than 60 minutes

5 0
2 years ago
During the summer holidays, your brother earns extra money mowing lawns. He mows 6 lawns an hour and has 21 lawns to mow. How lo
Triss [41]

Answer:

His brother will take 3.5 hours or 3\frac{1}{2} hours to mow 21 lawns

Step-by-step explanation:

Given:

His brother mows 6 lawns in an hour.

To find the time his brother takes to mow 21 lawns.

Solution:

We will unitary method to find the time he will take to mow 21 lawns.

If 6 lawns are mowed in 1 hour

So, 1 lawn will me mowed in = \frac{1}{6} hours.

Thus 21 lawns will be mowed in = \frac{1}{6}\times 21=\frac{21}{6}=3.5 hours.

Thus, his brother will take 3.5 hours or 3\frac{1}{2} hours to mow 21 lawns

4 0
3 years ago
Step by step explanation please so I can see how to do it
Basile [38]

Answer:

875 units

Step-by-step explanation:

35/5=7 AD and BC =7

25/5=5 the ratio of the to rect are 5

7(5)=35 EH and FG =35

25(35)=875

can you mark me the brainliest please

3 0
2 years ago
Write the inverse of the equation in f '(x) notation<br> X + 5y = 15
Sindrei [870]

Answer:

E

Step-by-step explanation:

7 0
2 years ago
Find the value of each variable.<br> 105°<br> 86°<br> 106°/2°
forsale [732]

Answer:

z = 74 degrees

y = 115 degrees

Step-by-step explanation:

Explanation in the attachment.

5 0
2 years ago
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