1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
TEA [102]
3 years ago
7

A student has received the following test scores: 71%, 89%, 72%,

Mathematics
1 answer:
lidiya [134]3 years ago
5 0

Answer: 81%

Step-by-step explanation:

From the question, we are informed that a student received the following test scores: 71%, 89%, 72%,

84% and 83% in 5 tests and the student wants to maintain an average of 80%.

The lowest score/grade they can receive on the next test to maintain at least an 80% average first thus:

First, to make it easy we can remove the percent sign. Then we multiply 80 by 6 since we're calculating for 6 tests scores. This will be:

= 80 × 6

= 480

We then add all the 5 test scores. This will be:

= 71 + 89 + 72 + 84 + 83

= 399

We then subtract the values gotten. This will be:

= 480 - 399

= 81

This means the student must get at least 81%

You might be interested in
6. A car dealership would like to estimate the mean mpg of its new model car with 90% confidence. The population is normally dis
Yakvenalex [24]

Answer:

92.9997<\mu<99.5203

Step-by-step explanation:

Using the formula for calculating the confidence interval expressed as:

CI = xbar ± Z * S/√n where;

xbar is the sample mean

Z is the z-score at 90% confidence interval

S is the sample standard deviation

n is the sample size

Given parameters

xbar = 96.52

Z at 90% CI = 1.645

S = 10.70.

n = 25

Required

90% confidence interval for the population mean using the sample data.

Substituting the given parameters into the formula, we will have;

CI = 96.52 ± (1.645 * 10.70/√25)

CI = 96.52 ± (1.645 * 10.70/5)

CI = 96.52 ± (1.645 * 2.14)

CI = 96.52 ± (3.5203)

CI = (96.52-3.5203, 96.52+3.5203)

CI = (92.9997, 99.5203)

<em>Hence a 90% confidence interval for the population mean using this sample data is 92.9997<</em>\mu<em><99.5203</em>

4 0
3 years ago
The number of ducks and pigs in a field totals 38. The total number of legs among them is 94 assuming each duck has exactly two
Reika [66]

Answer:

22 pigs and 3 ducks

Step-by-step explanation:

22 pigs would make 88 legs and 3 ducks will make 6 legs so u add that together and you get 94 legs (smile) ik i'm smart lol

8 0
3 years ago
W + 3 = 5z ; solve for w<br> ——— <br> 4
AveGali [126]

Answer:

all work is pictured and shown

8 0
3 years ago
I REALLY REALLY NEED HELP ON THIS I DON'T UNDERSTAND IT!!!!!!!!!!!!!!!!!
vodka [1.7K]

Answer:

d

Step-by-step explanation:

in order for it to be a triangle the angles have to add up to equal 180

5+75+100=180 so its not a

10+80+90=180 so its not b

20+60+100=180 so its not c

45+45+45=135 so its d because the angles dont add up to 180

50+50+80=180 so its not e

8 0
2 years ago
Read 2 more answers
Add the fractions.<br><br> 1/2+ 1/12
hjlf

Answer:

1283/1000

Step-by-step explanation:

or 2/14

7 0
2 years ago
Read 2 more answers
Other questions:
  • A 54-foot guy wire is attached to a utility pole to provide support for the pole. The wire forms a 60º angle with the ground. Ho
    10·1 answer
  • Can someone please help me I don’t understand.
    13·1 answer
  • A hacker is trying to guess someone's password. The hacker knows (somehow) that the password is 5 digits long, and that each dig
    11·1 answer
  • In which of the following graphs is the runner running the fastest?
    7·1 answer
  • Anyone know this???if so can u help me plz
    7·2 answers
  • The radius of a 10 inch right circular cylinder is measured to be 4 inches, but with a possible error of ±0.1 inch. What is the
    8·1 answer
  • Consider that the length of rectangle A is 21 cm and its width is 7 cm. Which rectangle is similar to rectangle A? A) A rectangl
    8·2 answers
  • Helpppppppppppppppppppppppppppppppp
    12·2 answers
  • There are 13 girls on Janelle's soccer team. Uniforms cost $32 each. Which equation uses estimation correctly to show about how
    13·1 answer
  • A neighborhood trash pick up comes every 5 days, while the recycling pick up is every 8 days. After how many days will both tras
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!