Answer:
18 boys
Step-by-step explanation:
boys/girls = 3/11 = b/66
3/11 = b/66
11b = 3 × 66
b = 3 × 6
b = 18
There are 18 boys.
Answer:
4
Step-by-step explanation:
3/4 +3/4 +3/4 +3/4= 12/4 =4
The question is wrong since population is not counted in points . for question like these use formula :P(1+R/100)^t where p is current population,r is rate and t is time.
Answer:
The answer is x = -7.7 ans x = -1.3
Step-by-step explanation:
Here is the work I did. I used the quadratic formula. Sorry about my bad handwriting.
Answer:
0.9127
Step-by-step explanation:
We solve using this z score formula
z = (x-μ)/√n
where x is the raw score
We are told that:
The sample mean would differ from the population mean by less than 231 miles
μ is the population mean = 49360
Hence,
(x-μ) = 231 Miles
σ is the population standard deviation.
We were given variance = 6,568,969
Standard deviation = √variance
= √6,568,969
= 2563
n = random number of tires = 247 tires
z = 231/256/√247
z = 1.41648
Probability value from Z-Table:
P(x < 49591) = 0.92168
≈ 0.9217
The probability that the sample mean would differ from the population mean by less than 231 miles in a sample of 247 tires if the manager is correct is 0.9127