How do i take pictures of homework

HELP PLEASE!!!!!!!!!!!!!!!

sukhopar [10]

Answer:

21

Step-by-step explanation:

6 0

2 years ago

Which terms of the AP: 213, 207, 201… is its last positive term?

riadik2000 [5.3K]

Answer: the last pos term is 3

Details:

213

207

201

195

189

183

177

171

165

159

153

147

141

135

129

123

117

111

105

99

93

87

81

75

69

63

57

51

45

39

33

27

21

15

9

3

-3

5 0

3 years ago

Rockwell hardness of pins of a certain type is known to have a mean value of 50 and a standard deviation of 1.3. (Round your ans

Maurinko [17]

Answer:

0.0039 is the probability that the sample mean hardness for a random sample of 12 pins is at least 51.

Step-by-step explanation:

We are given the following information in the question:

Mean, μ = 50

Standard Deviation, σ = 1.3

Sample size, n = 12

We are given that the distribution of hardness of pins is a bell shaped distribution that is a normal distribution.

Formula:

$z_{score} = \displaystyle\frac{x-\mu}{\sigma}$

Standard error due to sampling =

$=\dfrac{\sigma}{\sqrt{n}} = \dfrac{1.3}{\sqrt{12}} = 0.3753$

P(sample mean hardness for a random sample of 12 pins is at least 51)

$P( x \geq 51) = P( z \geq \displaystyle\frac{51 - 50}{0.3753}) = P(z \geq 2.6645)$

$= 1 - P(z < 2.6645)$

Calculation the value from standard normal z table, we have,

$P(x \geq 51) = 1 - 0.9961= 0.0039$

0.0039 is the probability that the sample mean hardness for a random sample of 12 pins is at least 51.

3 0

3 years ago

You are at a sandwich shop. You can choose from white or rye bread,

ryzh [129]

Answer:

C.

Step-by-step explanation:

the subset consists of all the sandwiches with turkey and american cheese

6 0

3 years ago

If 5 miles is 8 kilometers, which of the following is correct? A. 47.5 miles is 76 kilometers B. 52.5 miles is 86 kilometers C.

RUDIKE [14]

Answer:

A.47.5 miles is 76

Step-by-step explanation:

in real life its like 76.44, but im rounding

4 0

2 years ago