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scZoUnD [109]
3 years ago
11

Brenda does household chores for neighbors to earn spending money. One week she worked 312 hours for $4.75 an hour, 6 hours and

20 minutes for $5.75 an hour, and 834 hours for $3.25 an hour. To the nearest 10 dollars, how much did she make that week?
Mathematics
1 answer:
Amiraneli [1.4K]3 years ago
8 0

Answer:76

Step-by-step explanation:

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The ratio of boys to girls in the gym class at a local middle school is 3:2. what percent of the gym class is girls
sukhopar [10]
3 boys for every 2 girls
So, the percentage of girls is (2 / 5) x 100 = 40%


5 0
3 years ago
A graduate school entrance exam has scores that are normally distributed with a mean of 560 and a standard deviation of 90. What
9966 [12]

26.8% of examinees will score between 600 and 700.

This question is based on z score concept.

A Z-score is a numerical measurement that describes a value's relationship to the mean of a group of values. Z-score is measured in terms of standard deviations from the mean. If a Z-score is 0, it indicates that the data point's score is identical to the mean score.

z={x-\mu  \over \sigma }

where:

μ is the mean

σ is the standard deviation of the population

Given:

μ = 560

σ = 90

For

600≤ X≤700

for x = 700

Z score =x - μ/σ

=(700 - 560)/90

      = 1.55556

P-value from Z-Table:

P(560<x<700) = P(x<700) - 0.5 = 0.44009

for x = 600

Z score =x - μ/σ

=(600 - 560)/90

      = 0.44444

P-value from Z-Table:

P(560<x<600) = P(x<600) - 0.5 = 0.17164

∴ P(600<x<700) = P(560<x<700) - P(560<x<600)

                           = 0.44009 - 0.17164

                          =0.26845

∴26.8% percentage of examinees will score between 600 and 700.

Learn more about Z score here :

brainly.com/question/15016913

#SPJ4

4 0
2 years ago
1){(-8,-10), (-2,0), (1,10), (4,0)}<br> Domain=<br> Range-<br> Function?
adoni [48]

Answer:

domain(-8. -2. 1 4

range( -10 0 10 0

and the the given exp is function

8 0
3 years ago
A boy decided to save by an unusual method.He put 1cent, the first week.2cent in the second week,4xent in the third week,8cent i
lesya692 [45]

Answer:

Step-by-step explanation:

for 1st week=1 ¢

for 2nd week= 2¢

for 3rd week= 4¢

for 4th week=8¢

for 5th week=16¢

for 6th week=32¢

for 7th week=64¢

for 8th week=64+64=128¢

for 9th week= 128+128=256¢

for 10th week= 256+256=512¢

.: he saved a total of

1+2+4+8+16+32+64+128+256+512=1023¢

1023¢=1023/100=$10.23

4 0
3 years ago
Plot the points A(7,1), B(-2, 3), C(1, -7) on the coordinate axes below. State the
Tanzania [10]

      A             B

D              C

vectors

AB = DC

AB (-2-7 ; 3-1) => AB (-9 ; 2)

DC (1-x : -7-y)

1 - x = -9 => x = 10

-7-y = 2 => y = -9

D(10 ; -9)

4 0
2 years ago
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