Answer: the company should promote 4412 hours for these bulbs.
Step-by-step explanation:
Assuming that the lives of the bulbs are normally distributed, we would apply the formula for normal distribution which is expressed as
z = (x - µ)/σ
Where
x = lifetime of the bulbs in hours.
µ = mean hours
σ = standard deviation
From the information given,
µ = 4000 hours
σ = 200 hours
If only 2% burn out, then the company would promote 98% would meet the claimed lifetime. Looking at the normal distribution table, the z score corresponding to a probability of 0.98 is 2.06. Therefore,
2.06 = (x - 4000)/200
Cross multiplying, it becomes
200 × 2.06 = (x - 4000)
412 = x - 4000
x = 4000 + 412
x = 4412 hours
Answer:6/10
Step-by-step explanation:
hope youdo well
Answer:
Step-by-step explanation:
5. (a)
% increase = (new number - original number) / original number) * 100
= ((39.01 - 33.50) / 33.50) * 100
= (5.51 / 33.50) * 100
= 0.1644 * 100
= 16.44 rounds to 16.4% increase <==
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(b).
total purchase price...he bought 450 shares for 33.50 per share..
450 * 33.50 = $ 15,075 <==
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(c) total selling price...he sold 450 shares for 39.01 per share...
450 * 39.01 = $ 17,554.50 <==
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(d) percent capital gain..
% cap gain = (sold for - paid for) / paid for ) * 100
= (17,554.50 - 15,075) / 15,075) * 100
= (2479.50 / 15,075) * 100
= 0.1644 * 100
= 16.4% gain <===
Answer: 9 cups of sugar
explanation: 10/1.666=6
15/1.666=9
1/2 y= 2-4
1/2y=-2
y=-2*2=-4