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Lunna [17]
2 years ago
6

Need Help Please I'm Out Of Time ;( The mean age of Lincoln's tee-ball team is 5. Suppose one of his 7-year-old teammates quits

the team, but a 6-year-old joins the team. Is the mean age of Lincoln's team still 5? Explain your reasoning.
Mathematics
1 answer:
Nutka1998 [239]2 years ago
8 0

Answer:

no

Step-by-step explanation:

for eg

(7+3+5)/3 = 5

change the 7

(6+3+5)/3 = 4.666

so it changes

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Nicole has 17 nickels n and dimes d. If the value of her coins is $1.30, how many of each coin does she have?
denis-greek [22]

Answer:

  8 nickels and 9 dimes

Step-by-step explanation:

If all were dimes, the value would be $1.70. It is $0.40 less than that. Changing a dime for a nickel reduces the value by $0.05, so there must have been $0.40/$0.05 = 8 such changes.

There are 8 nickels and 9 dimes.

_____

<em>Check</em>

8 · 0.05 + 9 · 0.10 = 0.40 + 0.90 = 1.30 . . . the answer checks OK

7 0
3 years ago
Two numbers have a ratio of 4 to 5 and the sum of the numbers is 108 what are the two numbers??
ipn [44]

Answer: 48,60

Step-by-step explanation:

4x+5x=108

9x=108

x=108/9=12

12•4=48

12•5=60

8 0
3 years ago
Jenny has saved $600 from her summer job. During the school year, she withdraws $20 from her account every week for her daily ex
mel-nik [20]

Answer:

The answer is 14 weeks


6 0
2 years ago
In the figure, / is mapped onto / by a 180° rotation. Angle B corresponds to which angle in /? A. X )B. Y) C. Z) D. C)
GrogVix [38]
Which of the following best<span> represents a rotation
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B.
4 0
3 years ago
Read 2 more answers
4-13 Students in a management science class have just re- ceived their grades on the first test. The instructor has provided inf
inessss [21]

Answer:

a) y = 0.74x + 18.99; b) 80; c) r = 0.92, r² = 0.85; r² tells us that 85% of the variance in the dependent variable, the final average, is predictable from the independent variable, the first test score.

Step-by-step explanation:

For part a,

We first plot the data using a graphing calculator.  We then run a linear regression on the data.

In the form y = ax + b, we get an a value that rounds to 0.74 and a b value that rounds to 18.99.  This gives us the equation

y = 0.74x + 18.99.

For part b,

To find the final average of a student who made an 83 on the first test, we substitute 83 in place of x in our regression equation:

y = 0.74(83) + 18.99

y = 61.42 + 18.99 = 80.41

Rounded to the nearest percent, this is 80.

For part c,

The value of r is 0.92.  This tells us that the line is a 92% fit for the data.

The value of r² is 0.85.  This is the coefficient of determination; it tells us how much of the dependent variable can be predicted from the independent variable.

3 0
3 years ago
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