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3 years ago

B+18+3b=74 solve the equation and show your work

Mathematics

1 answer:

hjlf3 years ago

7 0

B+18+3b=74
4b+18=74
-18=-18
_________
4/4b=56/4
B=14

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Engineers want to design seats in commercial aircraft so that they are wide enough to fit 99% of all males. (Accommodating 100

Nezavi [6.7K]

Answer:

p99 = 16.4 inches

Step-by-step explanation:

Normal Probability Distribution:

Problems of normal distributions can be solved using the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the z-score of a measure X is given by:

$Z = \frac{X - \mu}{\sigma}$

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the p-value, we get the probability that the value of the measure is greater than X.

Men have hip breadths that are normally distributed with a mean of 14.3 in. And a standard deviation of 0.9 in.

This means that $\mu = 14.3, \sigma = 0.9$

Find p99.

This is the value of X when Z has a p-value of 0.99, so X when Z = 2.327. Then

$Z = \frac{X - \mu}{\sigma}$

$2.327 = \frac{X - 14.3}{0.9}$

$X - 14.3 = 0.9*2.327$

$X = 16.4$

p99 = 16.4 inches

8 0

3 years ago

Solve the proportion. 9/11 = 63/z. Please use "z =" to record your answer. *

klio [65]

Answer:

My Answer: <u>Z = 77</u>

Step-by-step explanation:

$\frac{9}{11}$ = $\frac{63}{z}$

9xZ = 11x63

9z = 693

$\frac{9z}{9}$ = $\frac{693}{9}$

z = 77

6 0

3 years ago

Read 2 more answers

In a study, the sample is chosen by pulling 50 names from a hat What is the sampling method? Simple Random Stratified Convenienc

spin [16.1K]

Answer: Simple Random

Step-by-step explanation:

A simple random sampling technique is a random sample technique in which a subset of the population is drawn by the researcher . They are chosen in such a way that all the individuals in the population has an equal chance to get chosen .

Given : In a study, the sample is chosen by pulling 50 names from a hat .

Here the probability of each name to get selected is equal.

Thus, this is a simple random sampling method.

7 0

3 years ago

What is the value of t on the truss of the bridge?

IceJOKER [234]

Answer:

Step-by-step explanation:

t° + 55° = 90° (Exterior angle of a triangle is equal to the sum of the opposite interior angles.)

${t}^{o} + {55}^{o} = {90}^{o} \\ {t}^{o} = {90}^{o} - {55}^{o} \\ {t}^{o} = {35}^{o} \\$