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Savatey [412]
3 years ago
13

The population mean score for a particular exam is 74 and the standard deviation is 9. What are the mean and standard deviation

of the class average score for classes composed of 36 students randomly drawn from the population?
Mathematics
1 answer:
Vaselesa [24]3 years ago
7 0

Answer:

Step-by-step explanation:

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Suppose the first comic book of a classic series was sold in 1954. in 2015, the estimated price for this comic book in good cond
lukranit [14]
1954 to 2015 = 61 years

310,000 = x*(1.22)^61

where x i original price

x = 310,000 / <span> <span> <span> 185,33</span></span></span>2

x = <span><span><span>1.67

Original price = 1.67 which seems a little high, but that's my answer.


x = </span></span></span><span><span>12.22
</span> </span>

3 0
3 years ago
3200 dollars is placed in an account with an annual interest rate of 6.5%. To the nearest year, how long will it take for the ac
madam [21]

4 yrs

Step-by-step explanation:

Formulae for simple interest is;

A= P (1 + rt)                Whereby;

   A = Total Accrued Amount (principal + interest)

   P = Principal Amount

   I = Interest Amount

   r = Rate of Interest per year in decimal; r = R/100

   R = Rate of Interest per year as a percent; R = r * 100

   t = Time Period involved in months or years

15300 = 3200 (1 + 106.5/100 *t)

15300/3200 = 1 + 1.065t

4.78125 – 1 = 1.065t

3.78125 = 1.065t

3.78125/1.065 = t

3.55 = t

Rounded off to the nearest whole number;

= 4

5 0
3 years ago
A random sample of size 16 is to be taken from a normal population having mean of 100 andvariance 4. What is the 90th percentile
viva [34]

Answer:  100+1.28(1/2)=100.64

Step-by-step explanation:

A random sample of size 16 is to be taken from a normal population having mean 100 and variance 4. ... The 90th percentile of the normal curve, according to the table I was provided, was equal to 1.28 standard units above the mean.

3 0
2 years ago
An elm tree is 3 1/2 times as an apple tree. The Apple tree is 10 2/3 feet tall. How tall is the elm tree?
Elena L [17]

Answer:

37 1/3

Step-by-step explanation:

10 2/3 * 3.5=37 1/3

8 0
3 years ago
Please let me know if I’m right, thank you.
Korvikt [17]

Answer:

Yes

Step-by-step explanation:

3 0
2 years ago
Read 2 more answers
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