$250-number\ of\ people\\\\\dfrac{2}{5}\ of\ the\ 250\ people\to\dfrac{2}{5}\cdot250=\dfrac{2}{1}\cdot50=100-number\ of\ girls\\\\\dfrac{3}{10}\ of\ the\ 250\ people\to\dfrac{3}{10}\cdot250=\dfrac{3}{1}\cdot25=75-number\ of\ boys\\\\100+75=175-number\ of\ girls\ and\ boys\\\\250-175=75-number\ of\ adults\\\\Answer:\ 75$

3 0

3 years ago

carmen prepared 14 kilograms of dough after working for 2 hours. How much did carmen prepare is she worked for 3 hours? solve us

barxatty [35]

14 = 2 hours of work

14/2 = 7 = number of dough produced in 1 hour

14+7= 21 kilo.

21 kilograms/ 3 hours

6 0

3 years ago

3 students want to share 2 2/3 twizzlers. How much twizzler will each student get?

Nookie1986 [14]

Each Students get 2 1.5 twizzlers

7 0

4 years ago

Read 2 more answers

a. A simple random sample of size 80 has a mean of 7.31. The population standard deviation is 6.26. Construct a 99% confidence i

Sever21 [200]

Answer:

5.503484≤x≤9.116516

Step-by-step explanation:

The formula for calculating the CI is expressed as;

CI = x±z*s/√n

x is the mean= 7.31

z is the 99% z-score = 2.58

s is the standard deviation = 6.26

n is the sample size = 80

Substitute into the formula

CI = 7.31± 2.58*6.26/√80

CI = 7.31± 2.58*6.26/8.94

CI = 7.31± (2.58*0.7002)

CI = 7.31±1.806516

CI = (7.31-1.806516, 7.31+1.806516)

CI = (5.503484, 9.116516)

Hence the 99% confidence interval for the population mean is

5.503484≤x≤9.116516

5 0

3 years ago