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Katena32 [7]
3 years ago
5

The average electricity bill for Lynn’s home is $64.50 per month with a standard deviation of $8.20. In June she received a bill

of only $30.00 because she was traveling for most of the month. How many standard deviations below the mean is the amount of Lynn’s electricity bill for June?
A.) 2.00
B.) 3.65
C.) 4.20
D.) 7.86
Mathematics
1 answer:
sveta [45]3 years ago
4 0
C. 

You can get this by taking the difference and dividing by the standard deviation. 
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What is 2 1/3 x 3 4/9
bogdanovich [222]

Answer:

is equal to 8 1/27

Step-by-step explanation:

(2

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9

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7 0
3 years ago
Read 2 more answers
jonas practice guitar for 2 hours in 2 years. Bradley practice 4 more hours the joans. How many more practice id Bradley did the
Zolol [24]

According to what your saying, the answer should be bradley got 4 more hours

Step-by-step explanation:

The grammar on this question is kind of bad so i might of misunderstood it but it should be 4 hours.

8 0
3 years ago
What is square root of 28 approximated to the nearest tenth?
Kryger [21]
Say to yourself - which whole numbers does the square root of 28 lie between.
Well 5 x 5 = 25  and 6 x 6 = 36.   So it lies between 5 and 6 and because 28 is a little closer to 25 than it is to 36, we should guess a number that is less than 5.5.

It doesn't matter whether I chose 5.4, 5.3, 5.2 or 5.1 but my best guess would be about 5.2 or 5.3.  I already know which is the better of the two having used a calculator.  But instead I am going pretend I don't have one handy and I will use 5.2
Now I will divide 28 by 5.2     28/5.2=5.38 rounded to the nearest hundredth.
Now I will find the average of my divisor (5.2) and my answer 5.38
(5.2+5.38)/2 = 5.29  I will use that number (5.29) as my new divisor
28/5.29 = 5.293 rounded.   I already have enough information to round the square root of 28 to the nearest tenth.  It will be 5.3 since the 9 is large enough 
 to round the 2 to a 3.  5.3 is the answer.
We could continue to average the answer and the divisor and use the new number to round the square root of 28 to the nearest 100th, 1000th and so on, but because the square root of 28 is irrational, we will never get an exact answer.  There is no number times itself that equals 28.
8 0
3 years ago
Amistad deposited $2,163.27 in a savings account that earns 3.9% simple interest. What will Amistad's account balance be in nine
avanturin [10]

Given that Amistad deposited $2,163.27 in a savings account that earns 3.9% simple interest.

That means we need to use Simple interest formula to find the Amistad's account balance in nine months.


Simple interest formula is

A=P(1+RT)

Where P= principal amount = $2163.27

R= rate of interest = 3.9%= 0.039

T= time in years = 9 months = 9/12 years = 0.75


Now plug these values into above formula:

A=2163.27(1+0.039* 0.75)

A=2163.27(1+0.02925)

A=2163.27(1.02925)

A=2226.5456475


Hence Amistad's account balance in nine months will be approx $2226.55

8 0
3 years ago
Z=x/y -3r make x the subject
satela [25.4K]
Z = x-y(3r)/y
z = x-y * 3r/y
Final answer: x = yz + 3yr
6 0
3 years ago
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