All categories

3 years ago

The set of life spans of an appliance is normally distributed with a mean y = 48 months and a standard deviation or

Mathematics

2 answers:

Kamila [148]3 years ago

4 0

Answer:

The set of life spans of an appliance is normally distributed with a mean µ= 48 months and a standard deviation σ= 8 months. ... Thanh finds that his grade on the test has a z-score of -2.5. ... are normally distributed, and the probability that the city gets more than 43.2 inches of rain in a year is given by P(z≥1.5)=0.0668.

Step-by-step explanation:

mixer [17]3 years ago

3 0

<h3>Answer: z = 2</h3>

=============================================================

Explanation:

The raw score is x = 64, and we want to find its corresponding z score.

The mean and standard deviation are mu = 48 and sigma = 8 respectively.

The z score is...

z = (x-mu)/sigma

z = (64-48)/8

z = 16/8

z = 2

A z score of 2 means we're 2 standard deviations above the mean.

As the formula above implies, we find the difference from the raw score (x) to the mean (mu). Then we divide over sigma to find out how many sigma steps we have to take to go from mu to x.

A negative z score would indicate the raw score is below the mean.

You might be interested in

Kendy and Fred keep borrowing and losing John’s pens. So John went to the store with $24 to spend on seven pens. After buying th

UkoKoshka [18]

Answer: each pen costed him 2 dollars

Explanation: 24 - 10 = 14
14 / 7 = 2 $ per each pen

6 0

3 years ago

PLZ HELPPPPP

QveST [7]

Use the quadratic formula with a = 2, b = -5, and c = 1

x = -b ± sq rt b2 - 4ac
-------------------- <---------- Please note: sq rt is over entire expression of b^2 - 4ac
2a

x = - (-5) ± sq rt (-5)2 + 4(2)(1)
-------------------------------- <---------Please note: sq rt is over entire expression (-5)2 + 4(2)(1)
2(2)

x = 5 ± √17
---------
4

x = 5 + 1√17 OR x = 5 + -1√17
--- --- --- ----
4 4 4 4

Answer: x = 5 + 1√17 OR x = 5 + -1√17
--- -- -- --
4 4 4 4

4 0

3 years ago

Jim is investing in the stock market. Jim is hoping to earn $2,000 in interest in order to take a trip to Mexico. Stock A earns

Vanyuwa [196]

Given:

Total amount for investment = $32000

Rate of interest for Stock A = 4%

Rate of interest for Stock B = 7%

Jim is hoping to earn $2,000 in interest.

To find:

The amount of investments in Stock A and Stock B.

Step-by-step explanation:

Let amount of investments in Stock A = $x

Amount of investments in Stock B = $y

Total amount for investment = $32000

$x+y=32000$ ...(i)

Rate of interests in Stock A and Stock B are 4% and 7%. Total interests is $2000.

$0.04x+0.07y=2000$ ...(ii)

From (i) and (ii), we get

$0.04x+0.07(32000-x)=2000$

$0.04x+2240-0.07x=2000$

$-0.03x=2000-2240$

$-0.03x=-240$

Divide both sides by -0.03.

$x=\dfrac{-240}{-0.03}$

$x=8000$

Put x=8000 in (i).

$8000+y=32000$

$y=32000-8000$

$y=24000$

Therefore, the amount of investments in Stock A and Stock B are $8000 and $24000 respectively.

8 0

3 years ago

So the section of fence Jason will be working on is 121 ft and 5 in long how many inches is this section of the fence ? Please e

Bas_tet [7]

THE ANSWER TO YOUR QUESTION IS 257 INCHES IN TOTAL.
BECAUSE, 21 FEET = 252 INCHES + 5 INCHES = 257

7 0

3 years ago

A company makes wax candles shaped like rectangular prisms. Each candle is 5cm long, 2cm wide, and 12cm tall. If the company use

Anettt [7]

Number of candles =(total volumes used by the company)/(volume of one candle)
volume of one candle =5cm*2cm*12cm=120cm^3
hence number of candles =5040/120
, ,=42candles

4 0

4 years ago

Read 2 more answers