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pochemuha
3 years ago
10

I've tried this question multiple times and I just don't understand how to do it :(​

Mathematics
1 answer:
Mariana [72]3 years ago
6 0

I think you substitute 189 for the letter t.

You actually do substitute.

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Suppose compact fluorescent light bulbs last, on average, 11,500 hours. The distribution is normal and the standard deviation is
juin [17]

Answer:

2.275%

Step-by-step explanation:

The first thing to do here is to calculate the z-score

Mathematically;

z-score = (x-mean)/SD

from the question, x = 12,300 hours , mean = 11,500 hours while Standard deviation(SD) = 400 hours

Plugging the values we have;

z-score = (12,300-11,500)/400 = 800/400 = 2

Now, we want to calculate P(z ≤ 2)

This is so because we are calculating within a particular value

To calculate this, we use the z-score table.

Mathematically;

P(z ≤ 2) = 1 - P(z > 2) = 1 - 0.97725 = 0.02275

To percentage = 2.275%

6 0
3 years ago
John bought a used truck for $4,500. He made an agreement with the dealer to put $1,500 down and make payments of $350 for the n
kumpel [21]
I think it is D But it could also be A
7 0
3 years ago
Mindy and Troy combined ate 9 99 pieces of the wedding cake. Mindy ate 3 33 pieces of cake and Troy had 1 4 4 1 ​ start fraction
saul85 [17]

Answer:

(a)There are 24 cakes in total

(b)There are 15 pieces of cakes left

Step-by-step explanation:

Let the total cakes=x

Let number of cakes eaten by Mindy=m

Let number of cakes eaten by Troy=t

Now:

m=3

Since m+t=9

3+t=9

t=9-3=6

The Number of Pieces of Cake Left in Total=x-(t+m)

Since Troy had \frac{1}{4} of the total cake

\frac{1}{4} of x=6

\frac{1}{4} X x=6

x=6X4=24

(a)There are 24 cakes in total

(b)The Number of Pieces of Cake Left in Total=x-(t+m)=24-9=15 cakes

5 0
3 years ago
Answer the question in the picture.
nlexa [21]

Answer:

The answer is C

Step-by-step explanation:

Reflecting across the y-axis is like folding across the y-axis.

2,-2, turns into -2,-2

Hope this helped!

8 0
3 years ago
A= 1 2 3 4 5 is the solution of a set of the variable equation<br> 3x=15
Harrizon [31]

Answer:

3x = 15

x = 15/3

x  =5

7 0
2 years ago
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