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Vitek1552 [10]
3 years ago
11

A light bulb manufacturer claims that the lifetime of the bulbs is normally distributed with a mean of 5000 hours and a standard

deviation of 250 hours. If 20000 bulbs are produced on a particular day, what percentage of the bulbs will have a lifetime of between 4750 and 5500 hours?
Mathematics
1 answer:
daser333 [38]3 years ago
8 0

Answer:

88

Step-by-step explanation:

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. The new saleswoman at Clocks Unlimited was very good. During her first day on the job she sold at least two of each of the thr
LiRa [457]

Answer:

5

Step-by-step explanation:

Let the number of the kitchen clock sold =a

Let the number of the cuckoo clock sold =b

Let the number of the two-foot high grandfather clocks sold =c

The new saleswoman sold at least two of each of the three models.

Therefore:

a\geq 2\\b \geq 2\\c \geq 2

In all, she collected $300 from selling these models alone

17a+31b+61c=300

17(2)+31(2)+61(2)=218

300-218=82

Next, we try to express the remainder (82) in terms of 17, 31 and 61

82=17(3)+31

Therefore, she sold:

  • 5 kitchen clocks
  • 3 cuckoo clocks
  • 2 two-foot high grandfather clocks

She sold 5 $17 clocks.

CHECK:

17(5)+31(3)+2(61)=$300

4 0
3 years ago
What would B and C equal?
finlep [7]

Answer:

b=42

c=180

Step-by-step explanation:

8 0
3 years ago
Read 2 more answers
How many solutions does x2 - 10x=-25 have?
Elina [12.6K]

Answer:

4.2 Solving x2-10x+25 = 0 by Completing The Square . This quadratic equation has one solution only. That's because adding zero is the same as subtracting zero.

Step-by-step explanation:

3 0
2 years ago
At a school concert the total value of tickets sold was $4452. Student tickets sold for $8 and adult tickets sold for $12. The n
White raven [17]

Answer:

there is 81 student and 317 adults adults :) got u

Step-by-step explanation:

4452 = 8n + (4n-7)12

4452 = 8n + 48n - 84

4536 = 56n

81 = n

4 0
2 years ago
To solve the following system of equations by elimination, which operation would you perform first?
Bingel [31]
Answer is <span>G. Subtraction

</span><span>234x+65y=219
1225x+65y=-427
</span><span>----------------------subtract

-991x = 646 to eliminate y and solve for x

</span>
8 0
3 years ago
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