20/q = 7/9
20×9 = 7q
7q = 180
q = 180/7
Answer:
9.90 units (3 s.f.)
Step-by-step explanation:
distance formula
Length of WX
The z-score corresponding to the actual mean of x = 15.2 can be calculated using the formula: z = (x - mean) / (SD / sqrt(n) ), where n is the sample size.
z = (15.2 - 15) / (1.8/sqrt(87)) = 1.04
Based on a z-table, the probability that z > 1.04 (and thus, the probability that x > 15.2) is 0.1492. This corresponds to a significance value of 1 - 0.1492 = 0.8508. Therefore, if alpha > 0.8508 (for example, 90%, 95%, or 99% confidence interval), then we fail to reject the null hypothesis, and assume that there is no significant difference from the mean.
1-8/9=1/9 of students do not have cell phone,
we can express this fraction as %
1/9*100%=11.11%≈ 11%