The masses in grams, of oranges sold at an orchard are normally distributed. $26.5$% of the orange

Question

The masses in grams, of oranges sold at an orchard are normally distributed. $26.5$% of the oranges weighed more than $160$ grams and $7$% of the oranges weighed less than $145$ grams. Find the mean and standard deviation of the mass of the oranges, leaving your answers correct to $2$ decimal places.[4]

Accepted Answer

mean =155.52, standard deviation = 7.13

2024 NYJC H1 Q6

2024 NYJC H1 Q6