Answer:
a) Between 74 and 90
b) 81.86% of the scores are between 78 and 90
Step-by-step explanation:
a) According to the Empirical Rule, in a normal distribution, 95% of the data are within 2 standard deviations of the mean. Therefore, the range that 95% of the scores fall in is between 82-4(2)=74 and 82+4(2)=90.
b) The percent of scores that are between 78 and 90 is: normalcdf(lower,upper,μ,σ) = normalcdf(78,90,82,4) = 0.8185946784 ≈ 0.8186, or about 81.86% of the scores.
You multiply them so it would be 0.08
Step-by-step explanation:
-137.24 would be the answer
Answer: try √265
Step-by-step explanation:
Answer:
x = 3, y = -24
Step-by-step explanation:
-3x - y = 15
y = -8x
Substitute the value of y into the first equation.
-3x - (-8x) = 15
-3x + 8x = 15
5x = 15
x = 3
Put the value of x into the second equation.
y = -8 * 3
y = -24