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kipiarov [429]
2 years ago
12

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Mathematics
1 answer:
wel2 years ago
5 0
$189,600
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A tire manufacturer believes that the life of its tires follow a normal distribution with a mean of 46,000 miles and a standard
Lelechka [254]

Answer:

Guarantee of Tyre = 36,680 miles

Step-by-step explanation:

Given:

Mean = 46,000 miles

Standard deviation = 4,000 miles

Computation:

Assume;

x = guaranteed lifetime

P(X > x) = 99%

So,

P(X > x) = 0.99

So,

P(Z > z) = 0.99

So,

1 - P(Z > z )  = P(Z < z)

P(Z < z) = 0.01

So, in z table value of z = -2.33

x = μ + [z x σ]

x = 46,000 + [-2.33 x 4000]

x = 36,680

Guarantee of Tyre = 36,680 miles

8 0
2 years ago
From a sample of 37 graduate​ students, the mean number of months of work experience prior to entering an MBA program was 35.15.
kiruha [24]

Answer: (29.35, 40.95)

Step-by-step explanation:

Formula to find the confidence interval for population mean :-

\overline{x}\pm z^*\dfrac{\sigma}{\sqrt{n}}

, where \overline{x} = sample mean.

z*= critical z-value

n= sample size.

\sigma = Population standard deviation.

As per given , we have

\overline{x}=35.15

\sigma=18

n= 37

Using z-table, the critical z-value for 95% confidence = z* = 1.96

Then, the confidence interval for the population mean will be :

35.15\pm (1.96)\dfrac{18}{\sqrt{37}}

=35.15\pm (1.96)\dfrac{1.7}{6.08276}

=35.15\pm (1.96)(2.95918)

\approx35.15\pm5.80

=(35.15-5.80,\ 35.15+5.80)=(29.35,\ 40.95)

Hence, a 95​% confidence interval for the population​ mean = (29.35, 40.95)

8 0
3 years ago
A football stadium will hold 965 students. The cost for a football ticket Is $13 . If a football game is sold out, how much mone
Mekhanik [1.2K]
13×965= $12,545
each person pays $13 and 965 people come so you times them together to get the answer
7 0
3 years ago
Factor completely 10xy + 3y + 20ax + 6a.
stiv31 [10]
10 xy + 3y + 20 ax + 6a = y(10x+3) + a(20x+6) = y(10x+3)+2a(10x+6)= 
(y+2a)(10x+3)
3 0
3 years ago
Read 2 more answers
Question ^^^^^^^^^^^^^^^^6
hichkok12 [17]

Answer:

no

Step-by-step explanation:

x+14=x14

4 0
2 years ago
Read 2 more answers
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