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3 years ago

Jeremiah jogged 3 3/4 miles on Saturday morning and 2 1/2 miles Saturday evening. How many miles did he jog on Saturday?

Mathematics

2 answers:

gregori [183]3 years ago

8 0

Answer:

$6\frac{1}{4}$ miles

Step-by-step explanation:

Total miles jogged on Saturday = Miles jogged morning + miles jogged eveming

total miles jogged = $3\frac{3}{4}$ + $2\frac{1}{2}$

add whole numbers first = 3+2 = 5

Add fractions = $\frac{3}{4}$ + $\frac{1}{2}$

Make denominator a factor of 4 and 2

$\frac{3+2}{4}$ = $\frac{5}{4}$ = $1\frac{1}{4}$

Add 5 + $1\frac{1}{4}$ = $6\frac{1}{4}$

Digiron [165]3 years ago

7 0

Answer:

6.25 Miles

6 1/4

Step-by-step explanation:

3 + 2 = 5 MILES

1/2 you want the denominator to equal 4 so you times it by two

= 2/4

2/4+3/4= 5/4

this gives you one full mile and 1/4

add all together 5+1+1/4

I am picking this is right :)

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2 years ago

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3 years ago

An English professor assigns letter grades on a test according to the following scheme. A: Top 15% of scores B: Scores below the

lisabon 2012 [21]

Answer:

59 to 66

Step-by-step explanation:

Mean test scores = u = 74.2

Standard Deviation = $\sigma$ = 9.6

According to the given data, following is the range of grades:

Grade A: 85% to 100%

Grade B: 55% to 85%

Grade C: 19% to 55%

Grade D: 6% to 19%

Grade F: 0% to 6%

So, the grade D will be given to the students from 6% to 19% scores. We can convert these percentages to numerical limits using the z scores. First we need to to identify the corresponding z scores of these limits.

6% to 19% in decimal form would be 0.06 to 0.19. Corresponding z score for 0.06 is -1.56 and that for 0.19 is -0.88 (From the z table)

The formula for z score is:

$z=\frac{x-u}{\sigma}$

For z = -1.56, we get:

$-1.56=\frac{x-74.2}{9.6}\\\\ x = 59$

For z = -0.88, we get:

$-0.88=\frac{x-74.2}{9.6}\\\\ x = 66$

Therefore, a numerical limits for a D grade would be from 59 to 66 (rounded to nearest whole numbers)

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3 years ago