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3 years ago

Can you please help???

Mathematics

1 answer:

marusya05 [52]3 years ago

5 0

Answer:

2 or 3 I think

I gessssssssssing

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At how many hours of service do the repair services cost at the same time?

makkiz [27]

The answer is c
Hope this helps :) also could I get brainliest please

4 0

3 years ago

[Q71 Suppose that the height, in inches, of a 25-year-old man is a normal random variable with parameters g = 71 inch and 02 = 6

viktelen [127]

Answer: (a) Percentage of 25 year old men that are above 6 feet 2 inches is 11.5%.

(b) Percentage of 25 year old men in the 6 footer club that are above 6 feet 5 inches are 2.4%.

Step-by-step explanation:

Given that,

Height (in inches) of a 25 year old man is a normal random variable with mean $g=71$ and variance $o^{2} =6.25$ .

To find: (a) What percentage of 25 year old men are 6 feet, 2 inches tall

(b) What percentage of 25 year old men in the 6 footer club are over 6 feet. 5 inches.

Now,

(a) To calculate the percentage of men, we have to calculate the probability

P[Height of a 25 year old man is over 6 feet 2 inches]= P[X> $74in$ ]

P[X>74] = P[ $\frac{X-g}{o}$ > $\frac{74-71}{2.5}$ ]

= P[Z > 1.2]

= 1 - P[Z ≤ 1.2]

= 1 - Ф (1.2)

= 1 - 0.8849

= 0.1151

Thus, percentage of 25 year old men that are above 6 feet 2 inches is 11.5%.

(b) P[Height of 25 year old man is above 6 feet 5 inches gives that he is above 6 feet] = P[X, $6ft$ $5in$ - X, $6ft$ ]

P[X > $6ft$ $5in$ I X > $6ft$ ] = P[X > 77 I X > 72]

= $\frac{P[X > 77]}{P[ X > 72]}$

= $\frac{P[\frac{X - g}{o}>\frac{77-71}{2.5}] }{P[\frac{X-g}{o} >\frac{72-71}{2.5}] }$

= $\frac{P[Z >2.4]}{P[Z>0.4]}$

= $\frac{1-P[Z\leq2.4] }{1-P[Z\leq0.4] }$

= $\frac{1-0.9918}{1-0.6554}$

= $\frac{0.0082}{0.3446}$

= 0.024

Thus, Percentage of 25 year old men in the 6 footer club that are above 6 feet 5 inches are 2.4%.

4 0

4 years ago

Question 1

Vlad1618 [11]

Answer: Yes

If you notice, you can actually see that each number is multiplied by 5:

1 x 5 = 5
2 x 5 = 10
3 x 5 = 15
4 x 5 = 20

Hope this helps you!

8 0

4 years ago

The ratio in a classroom is 5:4 <br> How many girls are there if there are 27 students?

kvasek [131]

Answer:

the answer depends if the ratio is 5 the answer is 15

if the ratio is 4 the answer is 12

Step-by-step explanation:

first add the ratios-5+4=9x

27 students

x=27/9=3

3*4 =12 or 3*5=15

please thank and mark brainliest if this helps!

4 0

4 years ago

a gas is compressed inside a compressor's cylinder. when the piston is at it's button dead center, the gas is initially at 10 ps

Andru [333]

Based on gas laws:

PV/T = Constant, P = Pressure, V = volume, T = Temperature (K)
Therefore,
P1V1/T1 = P2V2/T2

P1 = 10 psig
V1 = 10 in^3
T1 = 65°F = 291.483 K
P2 = ?
V2 = 1.5 in^3
T2 = 180°F = 355.372 K

Rearranging the equation,
P2 = P1V1T2/T1V2 = (10*10*355.372)/(291.483*1.5) = 81.279 psig

7 0

4 years ago