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Margaret [11]
2 years ago
12

I need help with this

Mathematics
1 answer:
Allisa [31]2 years ago
8 0

Answer:

d

Step-by-step explanation:

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NEED HELP ASAP laboratory tests show that the lives of light bulbs are normally distributed with a mean of 750 hours and a stand
professor190 [17]

Answer:

0.0214

Step-by-step explanation:

We can get these answer by finding the z-scores at first

Mathematically;

z-score = x-mean/sd

For 900;

z-score = 900-750/75 = 150/75 = 2

For 975

z-score = (975-750)/75 = 3

So the probability we want to calculate is;

P(2<x<3)

This can be calculated using the standard normal distribution table

From the standard score table;

P(2<x<3) = 0.0214

8 0
2 years ago
Of the new cars in the car dealership, 12% are red. If they have 50 new cars in their lot, how many cars are red?
marshall27 [118]

Answer:

6 red cars

Step-by-step explanation:

Multiply the number of cars by the percent that are red

50 * 12%

50 * .12

6

6 0
3 years ago
Read 2 more answers
What am I doing wrong?
Angelina_Jolie [31]
You didn't put x in !

3 0
3 years ago
In rectangle KLMN, KM = 10x + 24 and LN = 64. Find the value of x.
Mice21 [21]
_________X=30____
_________-________
5 0
3 years ago
In a jewelry store, rings makeup 5/9 of the inventory. Earrings make up 4/15 of the inventory. How many times greater is the rin
Free_Kalibri [48]
First let's make the denominators equal, so that we can compare the two fractions more easily.
To do this, we have to find a number that both 15 and 9 divide into. The smallest number that this can happen to is 45.

15 x 3 = 45
9 x 5 = 45

So we have to multiply 15 by 3 in order to make it into 45. If we're changing the denominator, the numerator must change too, by the same multiplier.

4 ---> 4 x 3 = 12
--
15 ---> 15 x 3 = 45

4/15 = 12/45


5 ---> 5 x 5 = 25
--
9 ---> 9 x 5 = 45

5/9 = 25/45

To find how many times more rings there are, we divide 25 by 12. As the result of this isn't an integer, we leave the answer as a fraction:

There rings inventory is 25/12 times bigger than the earrings inventory.
4 0
3 years ago
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