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saw5 [17]
3 years ago
14

The following are all 6 quiz scores of a student in a statistics course. Each quiz was graded on a 10-point scale. 8,6,9,9, 8, 8

Assuming that these scores constitute an entire population, find the standard deviation of the population. Round your answer to two decimal places.
Mathematics
2 answers:
Rufina [12.5K]3 years ago
8 0

Answer:

mean=6+8+8+9+9+10divided 6 =

Reika [66]3 years ago
8 0

Answer:

1.

Step-by-step explanation:

The mean score is (8+6+9+9+8+8)/ 6

= 48/8

= 8.

Deviations from the mean are 0 , -2, 1, 1, 0, 0

Squares of these deviations  are 0, 4, 1, 1, 0, 0

So the variance =  (0 + 4 + 1 + 1 + 0 + 0)/ 6 =  1

Standard deviation = √1 = 1.

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A runner is 7/8 mile from the finish line. If she can travel 3/8 mile per minute, how long will it take her to finish the race?​
Ksivusya [100]

Answer:

  • 2 1/3 minutes

Step-by-step explanation:

<u>Distance:</u>

  • d = 7/8 mile

<u>Speed:</u>

  • s = 3/8 mpm

<u>Time:</u>

  • t = d/s
  • t = 7/8 : 3/8 = 7/8 * 8/3 = 7/3 = 2 1/3 min
8 0
2 years ago
Read 2 more answers
If you are also able to explain this please do! I'd greatly appreciate it!
pogonyaev
You're given a table of x values and an equation. To solve, plug in the values for x.

First box: y=2(-3)-1=-7
Second box: y=2(-2)-1=-5.

See if you can solve the third one.
7 0
3 years ago
Read 2 more answers
Lucy have $6400 if she invests<br> $1200 at 15% interest<br> compounded quarterly?
svet-max [94.6K]

Answer:

  11.4 years

Step-by-step explanation:

We assume you want to know the time it takes for Lucy's investment of $1200 to have a value of $6400. The compound interest formula is good for finding that.

  FV = P(1 +r/n)^(nt)

for principal P invested at rate r per year for t years, compounded n times per year. We want to find t such that ...

  6400 = 1200(1 +0.15/4)^(4t)

  16/3 = 1.0375^(4t) . . . . divide by 1200

  log(16/3) = 4t·log(1.0375) . . . . take logarithms

  t = log(16/3)/(4·log(1.0375)) ≈ 11.4

It will take about 11.4 years for Lucy's investment value to be $6400.

8 0
3 years ago
If Q is between A and M and MQ = 12.5 and AM = 20.5, then QA =
iris [78.8K]
QA = 8

20.5 - 12.5 = 8
7 0
3 years ago
The larger of two numbers is 12 less than 5 times the smaller. If the smaller number is equal to one-third of the larger number,
klemol [59]

Answer:

one=12 sencond=1

Step-by-step explanation:

x=12

then,y=3

after that

first NUM,=12

second NUM=1

7 0
3 years ago
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