Edexcel IAL S1 2025 May | Blind-solved

CORRECTIONS
Q6(d) k should be 505. I mistakenly did 503*14 but it should be 502 in the calc. And hence, accordingly, p should just be 1 - P(Z less than 1) = 1 - 0.8413 = 0.1587

So I actually lost 2 marks there and got 73/75 🙏

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chapters
00:00:00 Introduction
00:01:04 Q1(a) Discrete Random Variable Finding Cumulative Probability
00:01:45 Q1(b) Discrete Random Variable Solving Inequality
00:02:37 Q1(c) Discrete Random Variable Finding Expected Value
00:03:51 Q1(d) Discrete Random Variable Showing Variance
00:05:51 Q1(e) Discrete Random Variable Coding and Variance
00:07:24 Q2(a) Combined Mean Showing a Value
00:08:32 Q2(b) Combined Standard Deviation Finding the Value
00:10:41 Q2(c) Coding Effect on Statistics
00:17:36 Q3(a) Statistical Models Reason for Use
00:19:45 Q3(b) Correlation and Regression Showing Sww
00:21:05 Q3(c) Correlation and Regression Finding Coded S values
00:27:35 Q3(d) Correlation and Regression Finding PMCC
00:28:45 Q3(e) Correlation and Regression Interpreting PMCC
00:30:33 Q3(f) Correlation and Regression Showing Regression Line
00:33:27 Q3(g) Correlation and Regression Coded Regression Line
00:35:18 Q3(h) Correlation and Regression Estimating and Interpreting
00:37:45 Q4(a) Probability Finding Intersection
00:38:45 Q4(b) Probability Finding P(C)
00:40:03 Q5(a) Histograms Calculating Bar Height
00:43:02 Q5(b) Grouped Data Estimating Frequency
00:46:12 Q5(c) Linear Interpolation Estimating Median
00:49:02 Q5(d) Linear Interpolation Finding Quartiles and IQR
00:52:13 Q5(e) Skewness Describing Skewness
00:54:23 Q5(f) Normal Distribution Commenting on Suitability
00:56:05 Q6(a) Normal Distribution Finding Probabilities
00:59:51 Q6(b) Binomial Distribution Finding Probability
01:02:43 Q6(c) Normal Distribution Showing Standard Deviation
01:04:47 Q6(d) Normal Distribution Solving for Constants
01:10:56 Q7(a) Tree Diagrams Completing Diagram
01:12:23 Q7(b) Probability Exactly One Yellow
01:14:30 Q7(c) Probability At Least One White
01:15:29 Q7(e) Probability Showing an Equation
01:23:45 Marking and Review
01:34:08 Outro

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