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Shalnov [3]
3 years ago
14

The following nine values represent race finish times in hours for a randomly selected group ofparticipants in an extreme 10k ra

ce (a 10k race with obstacles). Which of the following is closest tothe mean of the following data set?1.0, 1.2, 1.2, 1.3, 1.4, 1.5, 1.5, 1.7, 2.1
Mathematics
1 answer:
Leni [432]3 years ago
6 0

Answer:

The mean for the given sample of finish race time is 1.43 hours.

Step-by-step explanation:

We are given the following in the data set:

1.0, 1.2, 1.2, 1.3, 1.4, 1.5, 1.5, 1.7, 2.1

Formula:

Mean = \displaystyle\frac{\text{Sum of all observations}}{\text{Total number of observation}}

Mean =\displaystyle\frac{12.9}{9} = 1.43

The mean for the given sample of finish race time is 1.43 hours.

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A toy manufacturer claims that the mean time that its top-selling toy captures children's attention is at least 45 minutes. Supp
riadik2000 [5.3K]

Answer:

H_0:\mu =45\\\\H_a:\mu\geq 45

Step-by-step explanation:

Since we have given that

A toy manufacturer claims that the mean time that its top-selling toy captures children's attention is at least 45 minutes.

Since we need to carry out a hypothesis test whether he can refute the claim.

We always take the alternate hypothesis such that it should satisfy the given statement.

And the null hypothesis can be equal to mean or other than that is given in alternate hypothesis.

So, hypothesis :

H_0:\mu =45\\\\H_a:\mu\geq 45

5 0
3 years ago
Brad can type 1260 words in 1/2 hour. What is Brad’s average typing rate in words per minute?
Ilia_Sergeevich [38]

Brad average typing rate in words per minute is 21

1260 divided by 60 = 21

(In case you meant 30 minutes)

1260 divided by 30 = 42

5 0
3 years ago
Helppp pleaseee & thank you!!!
Nataly [62]

Answer:

A

Step-by-step explanation:

4 0
3 years ago
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Given the information in the diagram below, find the measure of angle N. Use RACE and complete sentences to show how you found t
Sonja [21]

Answer:

m<N = 76°

Step-by-step explanation:

Given:

∆JKL and ∆MNL are isosceles ∆ (isosceles ∆ has 2 equal sides).

m<J = 64° (given)

Required:

m<N

SOLUTION:

m<K = m<J (base angles of an isosceles ∆ are equal)

m<K = 64° (Substitution)

m<K + m<J + m<JLK = 180° (sum of ∆)

64° + 64° + m<JLK = 180° (substitution)

128° + m<JLK = 180°

subtract 128 from each side

m<JLK = 180° - 128°

m<JLK = 52°

In isosceles ∆MNL, m<MLN and <M are base angles of the ∆. Therefore, they are of equal measure.

Thus:

m<MLN = m<JKL (vertical angles are congruent)

m<MLN = 52°

m<M = m<MLN (base angles of isosceles ∆MNL)

m<M = 52° (substitution)

m<N + m<M° + m<MLN = 180° (Sum of ∆)

m<N + 52° + 52° = 180° (Substitution)

m<N + 104° = 180°

subtract 104 from each side

m<N = 180° - 104°

m<N = 76°

4 0
3 years ago
Can someone please help me with this problem?
Vedmedyk [2.9K]

Answer: -13

Step-by-step explanation:

c-2y

= -5-2(4)

= -5 - 8

= -13

5 0
3 years ago
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