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tekilochka [14]
3 years ago
12

A company makes batteries with an average life span of 300 hours with a standard deviation of 75 hours. Assuming the distributio

n is approximated by a normal curve fine the probability that the battery will last:(give 4 decimal places for each answer)
a. Less than 250 hours

b. Between 225 and 375 hours

c. More than 400 hours
Mathematics
1 answer:
Keith_Richards [23]3 years ago
4 0
Idk tbh, maybe the answer is A.
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Please help me, I know it’s not the first one but I think it’s the last one. Can somebody please confirm or deny?
GaryK [48]

Answer:

B. 2.2π m² : 3.2π m²

Step-by-step explanation:

Given:

Slant height (l) = 2.2 m

Diameter (d) = 2 m

Radius (r) = ½(2) = 1 m

Required:

Lateral area and surface area

Solution:

✔️Formula for lateral area of a cone = πrl

Plug in the values

Lateral area of the cone = π*1*2.2

Lateral area = 2.2π m²

✔️ Formula for surface area of a cone = πr(l + r)

Plug in the values

Surface area of the cone = π*1(2.2 + 1)

Surface area = π(3.2)

Surface area = 3.2π m²

The answer would therefore be:

2.2π m² : 3.2π m²

7 0
3 years ago
( Multiple choice) In the game of miniature golf, the ball bounces off the wall at the same angle it hit the wall. (This is the
Goshia [24]
The answer is A because if you do the 40 dagree and a coodinate plane it forms a triangle.
6 0
3 years ago
Read 2 more answers
What are the coordinates of R’, the image of R(-4,3) after a reflection in the line y=x?
navik [9.2K]

Answer:

R'(3,-4)

Step-by-step explanation:

we know that

When you reflect a point across the line y = x, the x-coordinate and y-coordinate change places

so

The rule of the reflection across the line y=x is equal to

(x,y) ------> (y,x)

we have

R(-4,3) ------> R'(3,-4)

6 0
3 years ago
the population of a city increased from 24500 to 41600 between 2003 and 2012 . find the change of population per year if we assu
AURORKA [14]
The change of population per year is 1,900

We'll start by subtracting; 41,600-24,500= 17,100
Then we'll divide 17,100 by 9 because there is a 9 year difference between 2003 and 2012.
17,100/<span>9=1,900</span>
5 0
3 years ago
If x=3 and y=-2 then<br> x2 - xy<br> x²+2y
Naddika [18.5K]

Answer:

Step-by-step explanation:

(3)*2=6

-

(3)*(-2)=-6

6-(-6)=12

3*3=9

+2(-2)=-4

9+ -4= 5

4 0
4 years ago
Read 2 more answers
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