1. The ratio of boys to girls in the math class is
2 answers:
You might be interested in
Hello!
Use the Pythagorean Theorem to solve for x:
a² + b² = c²
We are given the lengths of two sides, so we can plug those into the formula:
9² + 12² = x²
81 + 144 = x²
225 = x²
√225 = x
x = 15.
Answer:
Standard deviation of the sample = 17.421
Step-by-step explanation:
We are given that in a random sample of 80 teenagers, the average number of texts handled in one day is 50.
Also, the 96% confidence interval for the mean number of texts handled by teens daily is given as 46 to 54.
So, sample mean, = 50 and Sample size, n = 80
Let sample standard deviation be s.
96% confidence interval for the mean number of texts, is given by ;
96% confidence interval for =
[46 , 54] =
Since lower bound of confidence interval = 46
So, 46 =
50 - 46 =
s = = 17.421
Therefore, standard deviation of the sample is 17.421 .