Plz plz help test due soon

Solve for x. Round to the nearest tenth if necessary.

Natasha2012 [34]

Answer:

x = 16

Step-by-step explanation:

9/12 = 12/x

9x = 144

x = 16

7 0

3 years ago

Read 2 more answers

In Pant Science (May 2010), a group of Japanese environmental scientists investigated the ability of a hybrid tomato plant to pr

Neporo4naja [7]

Answer:

a) P(x > 120) = 0.03288

b) P(100 < x < 110) = 0.46777

c) value of a for which P(x < a) = 0.25

a = 99.91

Step-by-step explanation:

This is a normal distribution problem with

Mean = μ = 105.3

Standard deviation = σ = 8.0

a) P(x > 120)

To work this, we first need To convert 120 go standardized/normalized/z-scores.

The standardized score for any value is the value minus the mean then divided by the standard deviation.

z = (x - μ)/σ = (120 - 105.3)/8.0 = 1.84

To determine P(x > 120) = P(z > 1.84)

We use the tables for these probabilities now.

P(x > 120) = P(z > 1.84) = 1 - P(z ≤ 1.84) = 1 - 0.96712 = 0.03288

b) P(100 < x < 110)

We normalize the two value in the inequality

For 100,

z = (x - μ)/σ = (100 - 105.3)/8.0 = -0.66

For 110,

z = (x - μ)/σ = (110 - 105.3)/8.0 = 0.59

To determine P(100 < x < 110) = P(-0.66 < z < 0.59)

We use the tables for these probabilities now.

P(100 < x < 110) = P(-0.66 < z < 0.59) = P(z < 0.59) - P(z < -0.66) = 0.72240 - 0.25463 = 0.46777

c) value of a for which P(x < a) = .25

Let the z-score of a be z'

z' = (x - μ)/σ = (a - 105.3)/8.0

P(x < a) = P(z < z') = 0.25

Using the table, z' = - 0.674

-0.674 = (a - 105.3)/8

a - 105.3 = -5.392

a = 105.3 - 5.392 = 99.91

Hope this Helps!!!

5 0

3 years ago

One way to compute a 20% tip for a bill is to multiply it by 0.20. A restaurant bill was $35.70. Calculate the tip.

Dafna1 [17]

Answer:

7.14

Step-by-step explanation:

7 0

3 years ago

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If 95% and 98% confidence intervals were calculated from the same sample data in order to estimate the true cost of an appliance

damaskus [11]

Answer:

D) The z-statistics would be different.

Step-by-step explanation:

Confidence Interval can be calculated using M±ME where

M is the sample mean
ME is the margin of error from the mean

An margin of error (ME) from the mean can be calculated using the formula

ME= $\frac{z*s}{\sqrt{N} }$ where

z is the corresponding z-statistic in the given confidence level

s is the population standard deviation

N is the sample size

If 95% and 98% confidence intervals were calculated from the same sample data, then M, s and N are same.

$\frac{s}{\sqrt{N} }$ is called standard error. Since s and N are same the standard errors would also be same.

But, two tailed z-statistic for 95% confidence level is ≈1.96 where for 98% it is ≈2.33

8 0

4 years ago

Suppose Julie has already earned 36 points right and solve an addition equation to find the number of points he still needs to e

mario62 [17]

Answer:

$50 = 36 + p$

Step-by-step explanation:

Given

$Total = 50$

$Points = 36$

See attachment

Required

Determine the additional points (p) needed

The total point equals the sum of the already earned point and the points needed.

i.e.

$Total = Points + p$

Substitute values for Total and Points

$50 = 36 + p$

7 0

3 years ago