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quester [9]
3 years ago
8

A researcher has noted that the repair times of a sample of 15 new lawn mowers has a standard deviation of 4 minutes. A 95% conf

idence interval estimate for the variance of service times for all its new lawn mowers is:_______
a) 8.58 to 39.79
b) 1.64 to 1.96
c) 4 to 16
d) 4 to 15
Mathematics
1 answer:
mamaluj [8]3 years ago
4 0
Answer: C
Hope this helped
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Explain why a vertical line is said to have undefined slope or no slope.
Semmy [17]
A vertical linehas undefined slope because all points on the line have the same x-coordinate.
3 0
3 years ago
A police car drives 108km in 1 1/2 hours what is its average speed in kilometers per hour.
zhuklara [117]

ANSWER

72km/h

EXPLANATION

The average speed of the car can be calculated using the formula:

Average Speed=total distance/ total time taken.

The car covers a distance of 108km in 1½ hours.

We substitute the values into the formula to obtain,

Average  \:  \: Speed= \frac{108}{1.5}

Average  \:  \: Speed=72 {kmh}^{ - 1}

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7 0
3 years ago
Solve −2(−4n + 1)+5(25n − 8)=−62. <br><br><br><br> n= ?
In-s [12.5K]
N= -20/133

Step 1: Simplify both sides of the equation.
−
2
(
−
4
n
+
1
)
+
5
(
25
n
−
8
)
=
−
62
(
−
2
)
(
−
4
n
)
+
(
−
2
)
(
1
)
+
(
5
)
(
25
n
)
+
(
5
)
(
−
8
)
=
−
62
(Distribute)
8
n
+
−
2
+
125
n
+
−
40
=
−
62
(
8
n
+
125
n
)
+
(
−
2
+
−
40
)
=
−
62
(Combine Like Terms)
133
n
+
−
42
=
−
62
133
n
−
42
=
−
62
Step 2: Add 42 to both sides.
133
n
−
42
+
42
=
−
62
+
42
133
n
=
−
20
Step 3: Divide both sides by 133.
133
n
133
=
−
20
133
n
=
−
20
133
5 0
2 years ago
Read 2 more answers
Can somebody help me out?
Maru [420]

Answer:

the correct answer are the last three options

Step-by-step explanation:

i just took the test and got it right

8 0
3 years ago
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