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kondaur [170]
2 years ago
8

Multiply : 1 2/5 x 1/4

Mathematics
2 answers:
777dan777 [17]2 years ago
8 0

Answer:

0.35

Step-by-step explanation:

ivanzaharov [21]2 years ago
3 0

Answer:

7/20

Step-by-step explanation:

1 2/5 ×1/4=7/20

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48. Reading Rates The reading speed of sixth-grade students is approximately normal, with a mean speed of 125 words per minute a
son4ous [18]

Answer:

The reading speed of a sixth-grader whose reading speed is at the 90th percentile is 155.72 words per minute.

Step-by-step explanation:

Problems of normally distributed samples are solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this problem, we have that:

\mu = 125, \sigma = 24

What is the reading speed of a sixth-grader whose reading speed is at the 90th percentile

This is the value of X when Z has a pvalue of 0.9. So it is X when Z = 1.28.

Z = \frac{X - \mu}{\sigma}

1.28 = \frac{X - 125}{24}

X - 125 = 1.28*24

X = 155.72

The reading speed of a sixth-grader whose reading speed is at the 90th percentile is 155.72 words per minute.

4 0
3 years ago
Read 2 more answers
HELP ASAP
tia_tia [17]
2,700 / 12 = 225
225 / 5 = 45
They can make 45 necklaces.








3 0
3 years ago
Definition and description of gravity
Goryan [66]

Answer:

1. the force that attracts a body toward the center of the earth, or toward any other physical body having mass.

2. extreme or alarming importance; seriousness.

"crimes of the utmost gravity"

Step-by-step explanation:

Gravity, also called gravitation, in mechanics, the universal force of attraction acting between all matter. ... On Earth all bodies have a weight, or downward force of gravity, proportional to their mass, which Earth's mass exerts on them. Gravity is measured by the acceleration that it gives to freely falling objects.

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3 years ago
Sammy starts with $50 in her saving account and adds $50 each week. Write an equation that Sammy can use to show how much money
victus00 [196]

Known facts:

  • 50 dollars is the initial amount in the saving account
  • 50 dollars is added every week into the savings account.

Variables:

  • x: # of weeks
  • y: total amount of money in savings

Set equation based on known facts and variables:

  y = 50x + 50, 50x is the rate at which it grows depending on

   the week and 50 is the initial amount there

Hope that helps!

7 0
2 years ago
Samantha sends her son, barry, to a preschool center on certain days. The cost of preschool is $45 per day along with a fixed mo
Ipatiy [6.2K]
45d+70=$880. $880-70=$810. 810/45=18
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3 years ago
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