An air-conditioning repair technician claims to complete 67% of repairs in under an hour. A random sample of 31

Mathematics

1 answer:

igomit [66]2 years ago

4 0

Answer:

No, the difference between the sample result and what is expected is not extreme enough. The probability of it occurring by chance alone is not unlikely.

Step-by-step explanation:

Edge 2021

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A class of 28 students has 7 juniors and 21 seniors. The average (arithmetic mean) score of the juniors on a test was 73. The av

makkiz [27]

Answer:

Step-by-step explanation:

Given that the class has 28 students has 7 juniors and 21 seniors

mean score of the juniors = 73

Therefore, total score of junior = 73 × 7

= 511

mean score of seniors = y

Total score of seniors = 21y

Total score of the class = 511 + 21y

Mean score of the class = 85

Total score of the class = 85 × 28

= 2380

therefore,

511 + 21y = 2380

21y = 2380 -511

21y = 1869

y = 1869/21

y = 89

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2 years ago

What is 1647 + 1748 - 528 ?

dangina [55]

Answer:

2867

Step-by-step explanation:

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2 years ago

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Can someone figure out these for me.

tatiyna

Answer:

Algebra :(

Step-by-step explanation:

Anyway haiiiiiiii remember me Katie i saw your question lol haiii

3 0

2 years ago

Rewrite the expression in the form 5^n<br> 5^10/5^12

weqwewe [10]

Answer:

Step-by-step explanation:

This problem is all about bases and exponents. Because we have a quotient and the bases are both 5's, that means that we can use the rule of exponents for quotients to rewrite and simplify:

$\frac{5^{10}}{5^{12}}=5^{10-12}=5^{-2}$