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inna [77]
2 years ago
7

Brainliest need help

Mathematics
1 answer:
erastova [34]2 years ago
4 0

Answer:

p(71 <  \times  < 85) \\  = p( \frac{71 - 78}{4}  < z <  \frac{85 - 78}{4} ) \\  = p( - 1.75 < z < 1.75) \\  =1 -  (\phi(1.75)) \\  = 0.46  \times 100\%\\  = 46\%

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A statistics professor drew a random sample of 81 observations and found that x with bar on top equals 62 s equals 15. Estimate
ratelena [41]

Answer:

LCL = 59.26 to two decimal places

Step-by-step explanation:

Here, we want to estimate the LCL of the population mean with 90% confidence

We proceed as follows;

Given alpha = 0.1, then Z(0.05)=1.645 (from standard normal table), s = 15

Mathematically;

LCL =x_bar -Z*s/√( n)= 62 - (1.645 * 15)/√81

LCL = 62- (24.675)/9 = 59.2583

LCL = 59.26 to two decimal places

3 0
2 years ago
The graph of a system of equations with the same slope and the same y-intercepts will have no solution
Bumek [7]

Answer:

False.

Step-by-step explanation:

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5 0
3 years ago
Read 2 more answers
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Ludmilka [50]
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The answer is -378
7 0
3 years ago
In a certain region the average movie theater ticket price in 2009 was $7.80 in 2008 it was $7.37 find the increase in average m
PSYCHO15rus [73]

Answer:

your answer is .945 because you divide 7.37 by 7.80

7 0
2 years ago
Read 2 more answers
What is the value of 11x^-3 y^-1 <br> for x=-1 and y=2
andrey2020 [161]

Answer:

  -11/2

Step-by-step explanation:

Put the numbers into the expression and do the arithmetic.

  11(-1)^{-3}2^{-1}=\dfrac{11}{(-1)^3}\cdot\dfrac{1}{2^1}=\dfrac{-11}{2}

3 0
3 years ago
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