Zadanie 1b
The class frequencies are 5 for 20 ≤ h < 25, 11 for 25 ≤ h < 30, 16 for 30 ≤ h < 35, p for 35 ≤ h < 40 and q for 40 ≤ h < 45. (i) Find p and q. (ii) Estimate the mean from this table, to four significant figures.
- Materiał graficzny
Calculate or estimate measures of centre and spread and determine how shifting or scaling observations affects them.
Tę umiejętność sprawdza 19 zadań wzorowanych na arkuszach IB z lat 2022–2026.
The class frequencies are 5 for 20 ≤ h < 25, 11 for 25 ≤ h < 30, 16 for 30 ≤ h < 35, p for 35 ≤ h < 40 and q for 40 ≤ h < 45. (i) Find p and q. (ii) Estimate the mean from this table, to four significant figures.
State the mode.
Find (i) the mean; (ii) the median; (iii) the population standard deviation.
The interquartile range is 14 minutes. Find a.
(i) Show that . (ii) Hence find the mean of the eight areas in the form , where p is a positive rational number and a is a positive integer.
Find the median area in the form cm2, with q a positive rational number.
A record of completed assembly units has the following frequency distribution, where p, q are positive integers. Its population mean is 27 and its population variance is 153. Determine p and q.
Explain why the median of all 26 masses remains 18 g.
Find L and H.
Find the mean of x.
Estimate (i) the mean; (ii) the standard deviation.
Find p and q.
State the mean displayed score.
Find p and q.
Find x.
Find the population standard deviation.
Using the 1.5×IQR rule, find the largest c reading that would not be classified as an upper outlier.
State the median warm-cache latency.
Explain why the warm-cache mean appears likely to exceed its median.
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