3 years ago

Number 14 please help 10 points no links pleAse

Mathematics

1 answer:

marshall27 [118]3 years ago

5 0

Answer:

Step-by-step explanation:

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The quality control manager of a light bulb factory needs to estimate the average life of a large shipment of light bulbs. The p

eimsori [14]

Answer:

b) yes

The manufacturer has the right to state that the light bulbs last on average 400 hours

Step-by-step explanation:

Explanation:-

Given sample size 'n' = 64

Given standard deviation of the Population (σ)=100

Mean of the sample (x⁻) = 350 hours

95% of confidence interval is determined by

$(x^{-} -Z_{0.95} \frac{S.D}{\sqrt{n} } , x^{-} +Z_{0.95} \frac{S.D}{\sqrt{n} } )$

( $(350 -1.96 \frac{100}{\sqrt{64} } , 350+1.96\frac{100}{\sqrt{64} } )$

(350-24.5 , 350+24.5)

(325.5 , 374.5)

Conclusion:-

Yes

The manufacturer has the right to state that the light bulbs last on average 400 hours

4 0

3 years ago

In the given figure, show that angle a+angle b + angle c+angle d=360

djverab [1.8K]

Answer:

∠a + ∠b + ∠c + ∠d = 360°

Step-by-step explanation:

∠a + ∠c = 180°

∠b + ∠d = 180°

Therefore, 180 + 180 = 360°

8 0

3 years ago

Can someone help me

Alla [95]

Answer:

the solution to: f(x)=g(x)

is X=4

Explanation:

f(x)=g(x) is X=4 because the curves of f(x) and g(x) intersect at a point which has the abscissa 4.

7 0

2 years ago

Reduce the fraction

Doss [256]

Answer:

3/5

Step-by-step explanation:

72/2 =36

120/2 =60

=36/60

36/2 = 18

60/2 = 30

=18/30

18/2=9

30/2 =15

= 9/15

9/3=3

15/3 =5

= 3/5

5 0

2 years ago

If 2×2=4 and 4×4=8. What is 8×8?

Oxana [17]

Answer:

Step-by-step explanation:

7 0

2 years ago

Read 2 more answers